Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred stock	Common stock	Other paid-in capital	Retained earnings	Total accumulated other comprehensive loss	Treasury stock	Noncontrolling interest
Balance (in shares) at Dec. 31, 2014		150,000
Balance (in shares) at Dec. 31, 2013			189,868,780
Treasury stock (in shares) at Dec. 31, 2013							(538,921)
Balance at Dec. 31, 2013	$ 2,855,902	$ 15,000	$ 189,869	$ 1,056,996	$ 1,603,130	$ (38,205)	$ (3,626)	$ 32,738
Net income (loss) attributable to parent					298,233
Net loss attributable to noncontrolling interest								(3,895)
Net income (loss)	294,338
Other comprehensive income (loss)	(3,898)					(3,898)
Dividends declared on preferred stocks	(685)				(685)
Dividends declared on common stock	(137,851)				(137,851)
Stock-based compensation	6,191			6,191
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings			326,122
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	(5,564)		$ 326	(5,890)
Excess tax benefit on stock-based compensation	4,729			4,729
Issuance of common stock - shares			4,559,910
Issuance of common stock	149,722		$ 4,560	145,162
Contribution from non-controlling interest	86,900							86,900
Balance (in shares) at Dec. 31, 2013		150,000
Balance (in shares) at Dec. 31, 2014			194,754,812
Treasury stock (in shares) at Dec. 31, 2014							(538,921)
Balance at Dec. 31, 2014	3,249,784	$ 15,000	$ 194,755	1,207,188	1,762,827	(42,103)	$ (3,626)	115,743
Balance (in shares) at Dec. 31, 2015		150,000
Net income (loss) attributable to parent					(622,435)
Net loss attributable to noncontrolling interest								(35,256)
Net income (loss)	(657,691)
Other comprehensive income (loss)	4,955					4,955
Dividends declared on preferred stocks	(685)				(685)
Dividends declared on common stock	(143,352)				(143,352)
Stock-based compensation	3,689			3,689
Net tax deficit on stock-based compensation	(1,606)			(1,606)
Issuance of common stock - shares			1,049,853
Issuance of common stock	21,898		$ 1,050	20,848
Contribution from non-controlling interest	52,000							52,000
Distribution to non-controlling interest	$ (8,444)							(8,444)
Balance (in shares) at Dec. 31, 2014		150,000
Balance (in shares) at Dec. 31, 2015	195,804,665		195,804,665
Treasury stock (in shares) at Dec. 31, 2015	(538,921)						(538,921)
Balance at Dec. 31, 2015	$ 2,520,548	$ 15,000	$ 195,805	1,230,119	996,355	(37,148)	$ (3,626)	124,043
Balance (in shares) at Dec. 31, 2016		150,000
Net income (loss) attributable to parent					64,433
Net loss attributable to noncontrolling interest								(131,691)
Net income (loss)	(67,258)
Other comprehensive income (loss)	1,415					1,415
Dividends declared on preferred stocks	(685)				(685)
Dividends declared on common stock	(147,821)				(147,821)
Stock-based compensation	4,383			4,383
Net tax deficit on stock-based compensation	(1,663)			(1,663)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings			38,632
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	(323)		$ 38	(361)
Contribution from non-controlling interest	$ 7,648							7,648
Balance (in shares) at Dec. 31, 2015		150,000
Balance (in shares) at Dec. 31, 2016	195,843,297		195,843,297
Treasury stock (in shares) at Dec. 31, 2016	(538,921)						(538,921)
Balance at Dec. 31, 2016	$ 2,316,244	$ 15,000	$ 195,843	$ 1,232,478	$ 912,282	$ (35,733)	$ (3,626)	$ 0