Annual report pursuant to Section 13 and 15(d)

Deferred Charges - Schedule of Expected Amortization Expense (Details)

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Deferred Charges - Schedule of Expected Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Expected Amortization Expense [Line Items]  
Future Amortization Expense, Year One $ 16,037
Future Amortization Expense, Year Two 11,901
Future Amortization Expense, Year Three 9,606
Future Amortization Expense, Year Four 8,032
Future Amortization Expense, Year Five 6,930
Deferred Charges and Other Intangible Assets, Future Amortization Expense $ 52,506