Interest, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income (Expense), Net [Abstract]
Interest on borrowings, net settlements on interest rate derivatives, and other liabilities	$ 189,135	$ 196,176	$ 178,601
Hedge ineffectiveness (gains) losses	738	371	2,893
Amortization of interest rate derivatives related to deferred losses	34,979	33,265	30,777
Amortization of deferred financing costs	13,961	14,719	12,449
Interest Expense	238,813	244,531	224,720
Less interest income	(435)	(774)	(597)
Less capitalized interest	0	0	(1,315)
Interest, net	$ 238,378	$ 243,757	$ 222,808