Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Accumulated Other Comprehensive Income or Loss [Roll Forward]
Beginning Balance				$ (9,304)		$ (11,556)
Effective portion of interest rate contracts		$ 15,639	$ 0	12,106		0
Amortization of interest rate contracts	[1]	628	624	1,255	[2]	1,253	[2]
Other comprehensive income attributable to noncontrolling interests		(2,512)	(64)	(2,209)		(126)
Ending Balance		$ 1,848	$ (10,429)	$ 1,848		$ (10,429)

[1] Amounts reclassified from comprehensive income primarily to interest expense within the Company's Consolidated Statements of Operations.

[2] (1) Consists of amounts from previous interest rate hedging programs.