Consolidated Statements of Stockholders' Equity (Deficit) (USD $) In Thousands	Total	Common Shares [Member]	Capital in Excess of Par Value [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2011	$ 197,811	$ 11	$ 1,597,428	$ (1,103)	$ (1,398,525)
Beginning Balance, Shares at Dec. 31, 2011		114,485
Shares issued under equity compensation plans	4,117		4,117
Shares issued under equity compensation plans, Shares		774
Stock-based compensation	16,199		16,199
Other comprehensive income/(loss)	746			746
Net loss	(171,855)				(171,855)
Ending Balance at Dec. 31, 2012	47,018	11	1,617,744	(357)	(1,570,380)
Ending Balance, Shares at Dec. 31, 2012		115,259
Shares issued under equity compensation plans	8,208		8,208
Shares issued under equity compensation plans, Shares		1,235
Stock-based compensation	17,708		17,708
Other comprehensive income/(loss)	(824)			(824)
Net loss	(162,013)				(162,013)
Ending Balance at Dec. 31, 2013	(89,903)	11	1,643,660	(1,181)	(1,732,393)
Ending Balance, Shares at Dec. 31, 2013		116,494
Sale of common stock, net of issuance costs of $617	116,536	1	116,535
Sale of common stock, Shares		9,775
Shares issued under equity compensation plans	46,984	1	46,983
Shares issued under equity compensation plans, Shares		4,947
Stock-based compensation	17,017		17,017
Other comprehensive income/(loss)	(386)			(386)
Net loss	(53,916)				(53,916)
Ending Balance at Dec. 31, 2014	$ 36,332	$ 13	$ 1,824,195	$ (1,567)	$ (1,786,309)
Ending Balance, Shares at Dec. 31, 2014		131,216