Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Changes in Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Accumulated Other Comprehensive Income or Loss [Roll Forward]
Beginning Balance	$ (9,304)		$ (11,556)
Effective portion of interest rate contracts	(3,533)		0
Amortization of interest rate contracts	627	[1],[2]	629	[1],[2]
Other comprehensive income (loss) attributable to noncontrolling interests	303		(62)
Ending Balance	$ (11,907)		$ (10,989)

[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.