Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Earnings (Deficit)	Accumulated Other Comprehensive Income
Shares of Common Stock, Beginning of period at Dec. 31, 2012		39,493
Stockholders' Equity, Beginning of period at Dec. 31, 2012	$ 307,550	$ 39	$ (90,000)	$ 382,844	$ 14,536	$ 131
Shares of Treasury Stock, Beginning of period at Dec. 31, 2012			(5,952)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,979				23,979
Other comprehensive income (loss)	$ 40					40
Shares repurchased (in shares)	(885)		(885)
Stock repurchases	$ (20,962)		$ (20,962)
Share-based compensation	11,151			11,151
Issuance of common stock under employee stock plans (in shares)		2,349
Issuance of common stock under employee stock plans	26,886	$ 2		26,884
Tax payments related to restricted stock units	(2,223)			(2,223)
Income tax benefits from employee stock plans	2,576			2,576
Shares of Common Stock, End of period at Dec. 31, 2013		41,842
Stockholders' Equity, End of period at Dec. 31, 2013	348,997	$ 41	$ (110,962)	421,232	38,515	171
Shares of Treasury Stock, End of period at Dec. 31, 2013			(6,837)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,518				30,518
Other comprehensive income (loss)	$ (1,532)					(1,532)
Shares repurchased (in shares)	(884)		(884)
Stock repurchases	$ (24,091)		$ (24,091)
Share-based compensation	12,785			12,785
Issuance of common stock under employee stock plans (in shares)		1,695
Issuance of common stock under employee stock plans	21,795	$ 2		21,793
Tax payments related to restricted stock units	(3,744)			(3,744)
Income tax benefits from employee stock plans	5,370			5,370
Shares of Common Stock, End of period at Dec. 31, 2014		43,537
Stockholders' Equity, End of period at Dec. 31, 2014	$ 390,098	$ 43	$ (135,053)	457,436	69,033	(1,361)
Shares of Treasury Stock, End of period at Dec. 31, 2014	(7,721)		(7,721)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 30,760				30,760
Other comprehensive income (loss)	$ (1,369)					(1,369)
Shares repurchased (in shares)	(1,424)		(1,424)
Stock repurchases	$ (50,021)		$ (50,021)
Share-based compensation	14,921			14,921
Issuance of common stock under employee stock plans (in shares)		1,202
Issuance of common stock under employee stock plans	17,091	$ 2		17,089
Tax payments related to restricted stock units	(3,627)			(3,627)
Income tax benefits from employee stock plans	4,535			4,535
Shares of Common Stock, End of period at Dec. 31, 2015		44,739
Stockholders' Equity, End of period at Dec. 31, 2015	$ 402,388	$ 45	$ (185,074)	$ 490,354	$ 99,793	$ (2,730)
Shares of Treasury Stock, End of period at Dec. 31, 2015	(9,145)		9,145