Net Loss Per Share/Unit - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 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	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net loss attributable to the General Partner	$ (115,418)	$ 29,495	$ 3,146	$ (113,086)	$ (187,390)	$ 7,529	$ (106,522)	$ (29,970)	$ (195,863)	$ (316,353)	$ (977,185)
Dividends to preferred shares and units									(71,892)	(71,892)	(98,722)
Net (loss) income attributable to common stockholders and limited partners used in basic and diluted net (loss) income per share	(133,480)	11,368	(15,037)	(131,184)	$ (205,550)	$ (10,662)	$ (124,495)	$ (47,948)	(267,755)	(388,245)	(1,075,907)
Earnings allocated to participating securities									(492)	(410)	(5,335)
Net (loss) income available to common stockholders/unitholders and limited partners used in basic and diluted net income (loss) per share/unit	$ (133,480)	$ 12,107	$ (15,037)	$ (131,184)					$ (268,247)	$ (388,655)	$ (1,081,242)
Weighted-average shares outstanding - basic and diluted (shares)					903,638,159	903,461,323	903,339,143	902,996,270	931,422,844	903,360,763	793,150,098
Basic and diluted net loss per share attributable to common stockholders/unitholders (in dollars per share)	$ (0.14)	$ 0.01	$ (0.02)	$ (0.15)	$ (0.23)	$ (0.01)	$ (0.14)	$ (0.05)	$ (0.29)	$ (0.43)	$ (1.36)