Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balances at Dec. 31, 2014	$ 1,152,711	$ 1,600	$ 1,391,004	$ (239,345)	$ (548)
Beginning Balance, shares at Dec. 31, 2014		160,031,115
Shares of common stock issued in private placement, net of offering costs	434,125	$ 625	433,500
Shares of common stock issued in private placement, net of offering costs, shares		62,500,000
Stock-based compensation	3,394		3,394
Issuance of restricted stock		$ 2	(2)
Issuance of restricted stock, shares		143,155
Pension obligation adjustment, net of tax	409				409
Net loss	(157,541)			(157,541)
Ending Balances at Sep. 30, 2015	$ 1,433,098	$ 2,227	$ 1,827,896	$ (396,886)	$ (139)
Ending Balance, shares at Sep. 30, 2015		222,674,270