Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Revenues included in Discontinued Operations				$ 149,628
Net income (loss) attributable to common stockholders	$ 55,868	$ 5,305	$ 34,810	47,877	$ 17,609	$ 53,731	$ 32,480	$ 25,174
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Nonredeemable	92	16	64	85	36	94	61	49
Net Income (Loss) Allocated to General Partners	$ 55,960	$ 5,321	$ 34,874	$ 47,962	$ 17,645	$ 53,825	$ 32,541	$ 25,223
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.53	$ 0.05	$ 0.36	$ 0.49	$ 0.18	$ 0.57	$ 0.35	$ 0.27
Income (Loss) from Continuing Operations, Per Diluted Share					$ 0.18	$ 0.57	$ 0.34	$ 0.27
Earnings Per Share, Diluted	$ 0.53	$ 0.05	$ 0.35	$ 0.49
Scenario, Previously Reported [Member]
Revenues included in Discontinued Operations	$ 159,561	$ 152,769	$ 152,413		$ 146,167	$ 142,068	$ 141,129	$ 140,399