Fair Value Measurements (Details 1) - USD ($)		6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		$ (269,815,000)		$ (284,580,000)
Loss attributable to redeemable noncontrolling interest		9,757,000		7,191,000
Total realized and unrealized gains (losses):
Included in earnings		5,619,000		675,000
Included in other comprehensive income		10,698,000		9,217,000
Included in additional paid-in capital				(28,390,000)
Balance, ending		(243,741,000)		(295,887,000)
Redeemable Noncontrolling Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		(183,038,000)	[1]	(171,743,000)
Loss attributable to redeemable noncontrolling interest		9,757,000		7,191,000
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)
Balance, ending	[1]	(173,281,000)		(192,942,000)
Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		(73,536,000)		(97,360,000)
Loss attributable to redeemable noncontrolling interest		0		0
Total realized and unrealized gains (losses):
Included in earnings		0		0
Included in other comprehensive income		10,698,000		9,217,000
Included in additional paid-in capital				0
Balance, ending		(62,838,000)		(88,143,000)
Net TROR [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		(18,845,000)		(24,346,000)
Loss attributable to redeemable noncontrolling interest		0		0
Total realized and unrealized gains (losses):
Included in earnings		8,070,000		2,886,000
Included in other comprehensive income		0		0
Included in additional paid-in capital				0
Balance, ending		(10,775,000)		(21,460,000)
Fair value adjustment to the borrowings subject to TROR [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		5,604,000		8,869,000
Loss attributable to redeemable noncontrolling interest		0		0
Total realized and unrealized gains (losses):
Included in earnings		(2,451,000)		(2,211,000)
Included in other comprehensive income		0		0
Included in additional paid-in capital				0
Balance, ending		3,153,000		6,658,000
TROR Related [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		(13,241,000)		(15,477,000)
Loss attributable to redeemable noncontrolling interest		0		0
Total realized and unrealized gains (losses):
Included in earnings		5,619,000		675,000
Included in other comprehensive income		0		0
Included in additional paid-in capital				0
Balance, ending		$ (7,622,000)		$ (14,802,000)

[1] Redeemable noncontrolling interest is recorded at historical cost as of the period presented.