CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Stock	Common Stock	Paid-in Capital	Retained Earnings (Accumulated Deficit)	Deferred Compensation Obligation	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance as of beginning of period at Dec. 31, 2011	$ 846,309	$ 0	$ 270	$ 690,131	$ 157,242	$ 3,620	$ (1,084)	$ (3,870)
Balance as of beginning of period (in shares) at Dec. 31, 2011			45,714,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(104,589)				(104,589)
Dividends declared on preferred stock	(1,687)				(1,687)
Dividends declared on common stock	(5,176)				(5,176)
Issuance of stock (in shares)			9,200,000
Issuance of common stock	43,350		92	43,258
Issuance of preferred stock	110,462	1,150		109,312
Induced conversion of preferred stock	0
Share-based compensation (in shares)			80,000
Share-based compensation	6,347		1	6,346
Deferred compensation (in shares)			35,000
Deferred compensation	(2)					(509)		507
Restricted stock unit vesting (in shares)			88,000
Restricted stock unit vesting	0		1	(1)
Change in pension and postretirement benefit obligations	102						102
Balance as of end of period at Dec. 31, 2012	895,116	1,150	364	849,046	45,790	3,111	(982)	(3,363)
Balance as of end of period (in shares) at Dec. 31, 2012			55,117,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(143,070)				(143,070)
Issuance of common stock (shares)			10,000,000
Issuance of common stock	42,141		100	42,041
Dividends declared on preferred stock	(6,900)				(6,900)
Induced conversion of preferred stock	0
Share-based compensation (in shares)			78,000
Share-based compensation	5,781		1	5,780
Deferred compensation (in shares)			31,000
Deferred compensation	(677)			(679)		(319)		321
Exercise of stock options (in shares)			3,000
Exercise of stock options	16			16
Restricted stock unit vesting (in shares)			78,000
Restricted stock unit vesting	(251)		1	(252)
Change in pension and postretirement benefit obligations	1,249						1,249
Other	(4,601)			(4,601)
Balance as of end of period at Dec. 31, 2013	788,804	1,150	466	891,351	(104,180)	2,792	267	(3,042)
Balance as of end of period (in shares) at Dec. 31, 2013			65,307,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(409,592)				(409,592)
Dividends declared on preferred stock	(17,148)				(17,148)
Issuance of preferred stock	313,330	3,250		310,080
Conversion of preferred stock (in shares)			5,926,000
Conversion of preferred stock	0	(356)	59	297
Induced conversion of preferred stock	(4,256)				(4,256)
Share-based compensation (in shares)			15,000
Share-based compensation	3,627		1	3,626
Deferred compensation (in shares)			0
Deferred compensation	116			0		419		(303)
Exercise of stock options (in shares)	257,347		257,000
Exercise of stock options	1,428		3	1,425
Restricted stock unit vesting (in shares)			64,000
Restricted stock unit vesting	(474)		0	(474)
Change in pension and postretirement benefit obligations	(18)						(18)
Balance as of end of period at Dec. 31, 2014	$ 675,817	$ 4,044	$ 529	$ 1,206,305	$ (535,176)	$ 3,211	$ 249	$ (3,345)
Balance as of end of period (in shares) at Dec. 31, 2014			71,569,000