Noncontrolling Interests noncontrolling interests—property partnerships table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Beginning Balance	$ 1,602,467
Capital contributions	2,705
Dissolution	(4,082)
Net income (loss)	149,855	$ 30,561	$ 1,347
Accumulated other comprehensive loss	(2,982)	256	252
Ending Balance	1,574,400	1,602,467
Property Partnerships Member
Noncontrolling Interest [Line Items]
Beginning Balance	1,602,467	726,132	(1,964)
Fair value of capital recorded upon consolidation			480,861
Capital contributions	3,758	887,975	257,564
Dissolution	(4,082)
Net income (loss)	144,734	19,478	(5,290)
Accumulated other comprehensive loss	(2,428)
Distributions	(170,049)	(31,118)	(5,039)
Ending Balance	$ 1,574,400	$ 1,602,467	$ 726,132