CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	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)			(86,316)		(15)	(86,331)
Interest rate swaps, net of tax $61 and $10 for the three months ended March 31, 2015 and 2014, respectively				199		199
Capitalized swap interest, net of tax of $31 and $75 for the three months ended March 31, 2015 and 2014, respectively				(133)		(133)
Stock plan activity		1,764				1,764
Stock plan activity (in shares)	54,204
Balance at Mar. 31, 2014	396	2,831,577	(669,719)	(8,156)	6,547	2,160,645
Balance (in shares) at Mar. 31, 2014	39,630,548
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)			(105,959)			(105,959)
Distribution to noncontrolling interest					29	29
Interest rate swaps, net of tax $61 and $10 for the three months ended March 31, 2015 and 2014, respectively				512		512	[1]
Capitalized swap interest, net of tax of $31 and $75 for the three months ended March 31, 2015 and 2014, respectively				(59)		(59)	[2]
Stock plan activity	1	1,696	(1)			1,696
Stock plan activity (in shares)	69,241
Balance at Mar. 31, 2015	$ 397	$ 2,839,709	$ (712,894)	$ (7,259)	$ 3,772	$ 2,123,725
Balance (in shares) at Mar. 31, 2015	39,707,335

[1] Net of deferred tax expense of $0.1 million for the three months ended March 31, 2015 and 2014, respectively.

[2] Net of deferred tax benefit of $0.1 million for the three months ended March 31, 2015 and 2014, respectively.