Accounts Payable, Accrued Expenses and Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Accounts payable and accrued expenses	$ 22,014	$ 21,507
Deferred federal income tax liability	56,231	48,217
Accrued interest payable	48,638	38,273
Lease discounts, net of amortization of $7,328 and $5,528 respectively	8,009	596
Total accounts payable, accrued expenses and other liabilities	134,892	108,593
Deferred Revenue, Leases, Accumulated Amortization	$ 5,528	$ 7,328