Annual report pursuant to Section 13 and 15(d)

Supplementary Income Statement Information (Details)

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Supplementary Income Statement Information (Details) (Parent Company [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Parent Company [Member]
     
Supplementary Income Statement Information [Line Items]      
Advertising and Promotion Expense $ 21,880 $ 20,245 $ 18,951
Common Area Maintenance Expense 48,333 43,218 40,689
Real Estate Tax Expense 16,710 15,593 15,309
Other Cost and Expense, Operating 13,323 13,842 12,389
Operating Costs and Expenses $ 100,246 $ 92,898 $ 87,338