Derivative Instruments (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Loss (gain) on derivatives, net	$ 0	$ 2,309,000
Interest expense	120,833,000	108,838,000
Interest Rate Swap [Member]
Derivative [Line Items]
Gain (loss) recognized in OCI	(3,000)	946,000
Loss (gain) on derivatives, net	0	0
Interest expense	(443,000)	(475,000)
Foreign Exchange Contract [Member]
Derivative [Line Items]
Gain (loss) recognized in OCI	18,489,000	75,857,000
Loss (gain) on derivatives, net	$ 0	$ (2,309,000)