Equity, Capital and Other Interest Redeemable (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Redeemable Noncontrolling Interests - Operating Partnership	$ 500,733	$ 363,144	$ 398,372	$ 416,404
Change in carrying value	(2,229)	44,439	20,702
Partnership Interest [Member]
Redeemable Limited Partners	500,733	363,144
Redemption Value Limited Partners	500,733	363,144	398,372	416,404
Limited Partners Change In Redemption Value	139,818	(79,667)	(38,734)
Limited Partners Change In Carrying Value	$ (2,229)	$ 44,439	$ 20,702