Cumulative Other Comprehensive (Loss) Income (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassifications out of cumulative other comprehensive income (loss)
Interest expenses	$ 39,359	$ 50,736	$ 134,824	$ 148,924
Equity in earnings of investees	(10,492)	(2,868)	(14,913)	(8,655)
Total reclassifications	(1,265)		(3,720)
Amount Reclassified from Cumulative Other Comprehensive Income (Loss) to Net (Loss) Income
Reclassifications out of cumulative other comprehensive income (loss)
Total reclassifications	1,265		3,720
Unrealized gains and losses on available for sale securities
Reclassifications out of cumulative other comprehensive income (loss)
Total reclassifications			17
Unrealized gains and losses on available for sale securities | Amount Reclassified from Cumulative Other Comprehensive Income (Loss) to Net (Loss) Income
Reclassifications out of cumulative other comprehensive income (loss)
Equity in earnings of investees			(17)
Interest rate swap contracts | Amount Reclassified from Cumulative Other Comprehensive Income (Loss) to Net (Loss) Income
Reclassifications out of cumulative other comprehensive income (loss)
Interest expenses	$ 1,265		$ 3,737