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Quarterly Financial Data (Unaudited) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2010
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Jun. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Entity Information [Line Items] | |||||||||||
| Original Issuance Costs Related to Redeemed Preferred Shares | $ 3,000,000 | ||||||||||
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Parent Company [Member]
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| Entity Information [Line Items] | |||||||||||
| Revenues | 89,140,000 | 83,243,000 | 72,101,000 | 70,739,000 | 75,493,000 | 69,473,000 | 65,295,000 | 66,042,000 | 315,223,000 | 276,303,000 | 270,595,000 |
| Operating Income (Loss) | 28,266,000 | 26,177,000 | 22,319,000 | 21,174,000 | 24,815,000 | 23,698,000 | 20,100,000 | 11,018,000 | 97,936,000 | 79,631,000 | 69,940,000 |
| Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | 15,138,000 | 14,192,000 | 10,842,000 | 10,817,000 | 15,091,000 | 14,856,000 | 5,393,000 | 3,002,000 | 50,989,000 | 38,342,000 | 72,709,000 |
| Net Income (Loss) Available to Common Stockholders, Basic | 13,194,000 | 12,300,000 | 9,257,000 | 9,206,000 | 9,828,000 | 11,451,000 | 3,318,000 | 1,218,000 | 43,957,000 | 25,815,000 | 51,693,000 |
| Income (Loss) from Continuing Operations, Per Basic Share | $ 150.00 | $ 140.00 | $ 110.00 | $ 110.00 | $ 120.00 | $ 140.00 | $ 40.00 | $ 20.00 | $ 0.53 | $ 0.32 | $ 0.78 |
| Earnings Per Share, Basic | $ 150.00 | $ 140.00 | $ 110.00 | $ 110.00 | $ 120.00 | $ 140.00 | $ 40.00 | $ 20.00 | $ 0.53 | $ 0.32 | $ 0.72 |
| Income (Loss) from Continuing Operations, Per Diluted Share | $ 150.00 | $ 140.00 | $ 110.00 | $ 110.00 | $ 120.00 | $ 140.00 | $ 40.00 | $ 20.00 | $ 0.52 | $ 0.32 | $ 0.78 |
| Earnings Per Share, Diluted | $ 150.00 | $ 140.00 | $ 110.00 | $ 110.00 | $ 120.00 | $ 140.00 | $ 40.00 | $ 20.00 | $ 0.52 | $ 0.32 | $ 0.72 |
| Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 15,138,000 | 14,192,000 | 10,842,000 | 10,817,000 | 15,096,000 | 14,753,000 | 5,392,000 | 3,003,000 | 50,989,000 | 38,244,000 | 67,495,000 |
| Net Income (Loss) Attributable to Parent | $ 13,357,000 | $ 12,464,000 | $ 9,422,000 | $ 9,398,000 | $ 13,589,000 | $ 12,999,000 | $ 4,868,000 | $ 2,793,000 | $ 44,641,000 | $ 34,249,000 | $ 58,019,000 |
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- Details
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| X | ||||||||||
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- Definition
Original Issuance Costs Related to Redeemed Preferred Shares No definition available.
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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