Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common stock	Additional paid-in capital	Accumulated deficit	Treasury Stock	Accumulated other comprehensive loss
Balance at Dec. 31, 2012	$ 199,888	$ 494	$ 525,354	$ (322,115)	$ (3,337)	$ (508)
Balance (in shares) at Dec. 31, 2012		49,419,104			136,405
Increase (Decrease) in Stockholders' Equity
Equity component of Senior Convertible Notes	64,361	0	64,361	0	0	0
Convertible Note Hedge	(70,000)	0	(70,000)	0	0	0
Sale of warrants	41,475	0	41,475	0	0	0
Exercise of common stock options	22	0	22	0	0	0
Exercise of common stock options (in shares)		1,250			0
Stock-based compensation	4,220	0	4,220	0	0	0
Stock-based compensation (in shares)		28,110			0
Proceeds from Board of Directors stock purchases	17	0	17	0	0	0
Proceeds from Board of Directors stock purchases (in shares)		974			0
Treasury stock acquisition	(125)	0	0	0	(125)	0
Treasury stock acquisition (in shares)		0			7,005
Other comprehensive income (loss)	260					260
Net loss	(8,160)	0	0	(8,160)	0	0
Balance at Mar. 31, 2013	$ 231,958	$ 494	$ 565,449	$ (330,275)	$ (3,462)	$ (248)
Balance (in shares) at Mar. 31, 2013		49,449,438			143,410