Fair Value Measurements (Details 1) - USD ($)		9 Months Ended
		Sep. 30, 2015		Sep. 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		14,812,000		13,299,000
Total realized and unrealized gains (losses):
Included in earnings		4,476,000		633,000
Included in other comprehensive income		15,313,000		19,067,000
Included in additional paid-in capital				(28,390,000)
Balance, ending		(235,214,000)		(279,971,000)
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		14,812,000		13,299,000
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]	(168,226,000)		(186,834,000)
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		15,313,000		19,067,000
Included in additional paid-in capital				0
Balance, ending		(58,223,000)		(78,293,000)
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		7,775,000		2,912,000
Included in other comprehensive income		0		0
Included in additional paid-in capital				0
Balance, ending		(11,070,000)		(21,434,000)
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		(3,299,000)		(2,279,000)
Included in other comprehensive income		0		0
Included in additional paid-in capital				0
Balance, ending		2,305,000		6,590,000
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		4,476,000		633,000
Included in other comprehensive income		0		0
Included in additional paid-in capital				0
Balance, ending		$ (8,765,000)		$ (14,844,000)

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