Noncontrolling Interests Noncontrolling Redeemable Property Partnerships (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Noncontrolling Interest Redeemable Property Partnership [Abstract]
Beginning Balance	$ 104,692	$ 99,609
Net Income (Loss) for Redeemable interest in Property Partnership	75	(106)
Distributions on Redeemable Property Partnership	(1,400)	(1,050)
Adjustment to Reflect Redeemable Interest at Redemption Value	2,153	1,874
Ending Balance	$ 105,520	$ 100,327