Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Shares	Preferred Shares Paid-In Capital	Common Shares	Common Shares Paid-In Capital	Accumulated Deficit	Noncontrolling Interests
Balance at Dec. 31, 2015	$ 1,950,990		$ 378,983		$ 2,385,078	$ (895,950)	$ 82,879
Balance (in shares) at Dec. 31, 2015		14,950,000		100
Increase (Decrease) in Shareholders' Equity
Capital contributions	1,706						1,706
Capital distributions	(6,005)						(6,005)
Net income (loss)	(197,699)					(182,164)	(15,535)
Distributions declared on preferred shares	(6,891)					(6,891)
Distributions to Parent	(38,314)					(38,314)
Balance at Mar. 31, 2016	1,703,787		378,983		2,385,078	(1,123,319)	63,045
Balance (in shares) at Mar. 31, 2016		14,950,000		100
Balance at Dec. 31, 2016	1,868,185		378,983		2,385,078	(967,452)	71,576
Balance (in shares) at Dec. 31, 2016		14,950,000		100
Increase (Decrease) in Shareholders' Equity
Capital contributions	2,245						2,245
Capital distributions	(3,066)						(3,066)
Net income (loss)	139,515					137,540	1,975
Distributions declared on preferred shares	(6,891)					(6,891)
Distributions to Parent	(70,084)					(70,084)
Contributions from Parent	17,621					17,621
Balance at Mar. 31, 2017	1,947,025		$ 378,983		$ 2,385,078	(889,766)	$ 72,730
Balance (in shares) at Mar. 31, 2017		14,950,000		100
Increase (Decrease) in Shareholders' Equity
Effect from de-consolidation of subsidiaries | Cumulative-Effect Adjustment, Deconsolidation of Variable Interest Entity	$ (500)					$ (500)