Fair Value Measurements (Details 1) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	$ (284,580,000)	$ (368,642,000)
Loss attributable to redeemable noncontrolling interest	7,191,000	11,373,000
Total realized and unrealized gains (losses):
Included in earnings	675,000	(1,725,000)
Included in other comprehensive income	9,217,000	23,589,000
Included in additional paid-in capital	(28,390,000)	(2,237,000)
Balance, ending	(295,887,000)	(337,642,000)
Redeemable Noncontrolling Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	(171,743,000)	(240,790,000)
Loss attributable to redeemable noncontrolling interest	7,191,000	11,373,000
Total realized and unrealized gains (losses):
Included in earnings	0	0
Included in other comprehensive income	0	0
Included in additional paid-in capital	(28,390,000)	(2,237,000)
Balance, ending	(192,942,000)	(231,654,000)
Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	(97,360,000)	(131,634,000)
Loss attributable to redeemable noncontrolling interest	0	0
Total realized and unrealized gains (losses):
Included in earnings	0	0
Included in other comprehensive income	9,217,000	23,589,000
Included in additional paid-in capital	0	0
Balance, ending	(88,143,000)	(108,045,000)
Net TRS [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	(24,346,000)	(6,108,000)
Loss attributable to redeemable noncontrolling interest	0	0
Total realized and unrealized gains (losses):
Included in earnings	2,886,000	(1,621,000)
Included in other comprehensive income	0	0
Included in additional paid-in capital	0	0
Balance, ending	(21,460,000)	(7,729,000)
Fair value adjustment to the borrowings subject to TRS [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	8,869,000	9,890,000
Loss attributable to redeemable noncontrolling interest	0	0
Total realized and unrealized gains (losses):
Included in earnings	(2,211,000)	(104,000)
Included in other comprehensive income	0	0
Included in additional paid-in capital	0	0
Balance, ending	6,658,000	9,786,000
TRS Related [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	(15,477,000)	3,782,000
Loss attributable to redeemable noncontrolling interest	0	0
Total realized and unrealized gains (losses):
Included in earnings	675,000	(1,725,000)
Included in other comprehensive income	0	0
Included in additional paid-in capital	0	0
Balance, ending	$ (14,802,000)	$ 2,057,000