Condensed Consolidated Statements of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2014	$ 585,318	$ 1,034	$ 2,789,695	$ (2,202,603)	$ (2,808)
Balances, in shares at Dec. 31, 2014		103,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(49,965)	$ 0	0	(49,965)	0
Other comprehensive loss	(364)	0	0	0	(364)
Common stock issued under stock-based compensation plans, net	3,844	$ 10	3,834	0	0
Common stock issued under stock-based compensation plans, net		1,071
Balances at Jun. 30, 2015	$ 727,650	$ 1,371	2,982,019	(2,252,568)	(3,172)
Balances, in shares at Jun. 30, 2015		137,122
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Acquisitions	32,667	32,667
Stock Issued During Period, Value, Acquisitions	$ 188,817	$ 327	$ 188,490	$ 0	$ 0