Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings (Accumulated Deficit) [Member]
Beginning balance at Dec. 31, 2010			$ 252,565
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Excess tax benefit related to stock options			3,023
Ending balance at Apr. 02, 2011
Beginning balance at Dec. 31, 2010	231,127	27	252,565	(26,540)	(118)	5,193
Beginning balance (in shares) at Dec. 31, 2010		24,739,040
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net issuance of common stock under stock option plans, shares		1,098,954
Net issuance of common stock under stock option plans	13,613	0	13,599	14
Stock-based compensation	9,017		9,017
Comprehensive Income (Loss)	19
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss)	19				19
Net income	39,230					39,230
Total comprehensive income	39,249
Ending balance at Dec. 31, 2011	296,029	27	278,204	(26,526)	(99)	44,423
Ending balance (in shares) at Dec. 31, 2011		25,837,994
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Excess tax benefit related to stock options			6,961
Ending balance at Mar. 31, 2012
Beginning balance at Dec. 31, 2011	296,029	27	278,204	(26,526)	(99)	44,423
Beginning balance (in shares) at Dec. 31, 2011		25,837,994
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net issuance of common stock under stock option plans, shares		1,254,248
Net issuance of common stock under stock option plans	12,355	1	12,340	14
Stock-based compensation	12,512		12,512
Excess tax benefit related to stock options	9,900
Comprehensive Income (Loss)	142
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss)	142				142
Net income	47,187					47,187
Total comprehensive income	47,329
Ending balance at Dec. 31, 2012	375,186	28	310,017	(26,512)	43	91,610
Ending balance (in shares) at Dec. 31, 2012	27,092,242	27,092,242
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net issuance of common stock under stock option plans, shares		762,311
Net issuance of common stock under stock option plans	9,374	1	9,358	15
Stock-based compensation	15,473		15,473
Excess tax benefit related to stock options			384
Comprehensive Income (Loss)	(110)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss)	(110)				(110)
Net income	(13,769)					(13,769)
Total comprehensive income	(13,879)
Ending balance at Dec. 31, 2013	$ 386,538	$ 29	$ 335,232	$ (26,497)	$ (67)	$ 77,841
Ending balance (in shares) at Dec. 31, 2013	27,854,553	27,854,553