CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2012	$ 291,194	$ 29	$ (35,548)	$ 647,515	$ (1,655)	$ (319,147)
Balance (in shares) at Dec. 31, 2012			(1,504)
Balance (in shares) at Dec. 31, 2012	29,163	29,163
Increase (Decrease) in Stockholders' Equity
Common stock issued on exercise of stock options	1,239			1,239
Common stock issued on exercise of stock options (in shares)		174
Common stock issued on vesting of restricted stock units (in shares)		16
Common stock issued on vesting of restricted stock units, net of shares tendered to satisfy required tax withholding	(272)			(272)
Common stock issued on vesting of restricted stock units, net of shares tendered to satisfy required tax withholding (in shares)		114
Common stock issued under employee stock purchase plan	152			152
Common stock issued under employee stock purchase plan (in shares)		18
Share-based compensation	9,672			9,672
Other comprehensive loss	(1,155)				(1,155)
Net income	604					604
Balance at Sep. 30, 2013	$ 301,434	$ 29	$ (35,548)	$ 658,306	$ (2,810)	$ (318,543)
Balance (in shares) at Sep. 30, 2013			(1,504)
Balance (in shares) at Sep. 30, 2013	29,485	29,485