CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2013	$ 396	$ 2,829,813	$ (583,403)	$ (8,222)	$ 6,562	$ 2,245,146
Balance (in shares) at Dec. 31, 2013	39,576,344
Increase (Decrease) in Stockholders' Equity
Net income (loss)			(55,461)		12	(55,449)
Preferred dividend payment on behalf of subsidiary					(12)	(12)
Interest rate swaps, net of tax $800 and $135 for the nine months ended September 30, 2015 and 2014, respectively				902		902	[1]
Capitalized swap interest, net of tax (benefit) of $83 and $126 for the nine months ended September 30, 2015 and 2014, respectively				(357)		(357)	[2]
Stock plan activity		5,940				5,940
Stock plan activity (in shares)	61,750
Balance at Sep. 30, 2014	$ 396	2,835,753	(638,864)	(7,677)	6,562	2,196,170
Balance (in shares) at Sep. 30, 2014	39,638,094
Balance at Dec. 31, 2014	$ 396	2,838,013	(606,934)	(7,712)	3,743	2,227,506
Balance (in shares) at Dec. 31, 2014	39,638,094
Increase (Decrease) in Stockholders' Equity
Net income (loss)			100,838			100,838
Distribution to noncontrolling interest					29	29
Interest rate swaps, net of tax $800 and $135 for the nine months ended September 30, 2015 and 2014, respectively				297		297	[1]
Capitalized swap interest, net of tax (benefit) of $83 and $126 for the nine months ended September 30, 2015 and 2014, respectively				(154)		(154)	[2]
Stock plan activity	$ 2	7,008				7,010
Stock plan activity (in shares)	76,744
Balance at Sep. 30, 2015	$ 398	$ 2,845,021	$ (506,096)	$ (7,569)	$ 3,772	$ 2,335,526
Balance (in shares) at Sep. 30, 2015	39,714,838

[1] Amount is shown net of deferred tax expense of $0.2 million and $0.8 million for the three and nine months ended September 30, 2015, respectively. For the three and nine months ended September 30, 2014, amounts are shown net of deferred tax benefit of $0.1 million and $0.2 million, respectively.

[2] Net of deferred tax benefit of $0.1 million for the three and nine months ended September 30, 2015, respectively. For the three and nine months ended September 30, 2014, amounts shown net of deferred tax benefit of $0.1 million and $0.2 million, respectively.