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Interest Payable , Accounts Payable And Accrued Liabilities (Schedule Of Accounts Payable And Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable and accrued liabilities	$ 34,530	$ 28,360
Accrued interest payable	9,780	10,781
Deferred revenue	13,190	16,139
Total interest payable, accounts payable and accrued liabilities	$ 57,500	$ 55,280

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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