Net Loss Per Share/Unit (Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net loss attributable to the General Partner	$ (113,086)	$ (29,970)
Less: dividends to preferred shares and participating securities	18,098	17,978
Net loss attributable to common stockholders / unitholders	$ (131,184)	$ (47,948)
Weighted average number of common shares outstanding - basic and diluted (shares)	903,825,726	902,996,270
Basic and diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.15)	$ (0.05)