Net Loss Per Share/Unit (Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss) attributable to the General Partner	$ 3,146	$ (106,522)	$ (109,940)	$ (136,492)
Less: dividends to preferred shares and units and participating securities	18,183	17,973	36,281	35,951
Net loss attributable to common stockholders / unitholders	$ (15,037)	$ (124,495)	$ (146,221)	$ (172,443)
Weighted average number of common stock outstanding - basic and diluted (shares)	904,107,378	903,339,143	903,966,552	903,168,654
Basic and diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.02)	$ (0.14)	$ (0.16)	$ (0.19)