Noncontrolling Interests noncontrolling interests—property partnerships table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Beginning Balance	$ 1,574,400
Capital contributions	11,951	$ 2,705
Dissolution		(4,082)
Net income (loss)	(2,068)	149,855	$ 30,561
Accumulated other comprehensive loss	(5,256)	(2,982)	256
Ending Balance	1,530,647	1,574,400
Property Partnerships Member
Noncontrolling Interest [Line Items]
Beginning Balance	1,574,400	1,602,467	726,132
Capital contributions	10,756	3,758	887,975
Dissolution		(4,082)
Net income (loss)	(2,068)	144,734	19,478
Accumulated other comprehensive loss	(877)	(2,428)
Distributions	(51,564)	(170,049)	(31,118)
Ending Balance	$ 1,530,647	$ 1,574,400	$ 1,602,467