Net Income (Loss) Per Share/Unit (Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income (loss) attributable to the General Partner	$ 29,495	$ 7,529	$ (80,445)	$ (128,963)
Dividends to preferred shares and units	(17,973)	(17,974)	(53,919)	(53,920)
Net income (loss) available to the General Partner	11,522	(10,445)	(134,364)	(182,883)
Earnings allocated to participating securities	(154)	(217)	(400)	(222)
Income attributable to limited partners	(739)	0	0	0
Net Income (loss) attributable to common stockholders/unitholders and limited partners used in basic and diluted net income (loss) per share/unit	$ 12,107	$ (10,662)	$ (134,764)	$ (183,105)
Weighted average number of common stock outstanding - basic (shares)	943,480,170	903,461,323	917,233,898	903,267,282
Effect of Limited Partner OP Units and dilutive securities (shares)	25,206,373	0	0	0
Weighted average number of common stock outstanding - diluted (shares)	968,686,543	903,461,323	917,233,898	903,267,282
Basic and diluted net income (loss) per share attributable to common stockholders and limited partners (in dollars per share)	$ 0.01	$ (0.01)	$ (0.15)	$ (0.20)