Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings (Deficit) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2010	$ 102,922	$ 155	$ 98,905	$ (184)	$ 4,046
Beginning Balance, Shares at Dec. 31, 2010		15,458,002
Net income (loss)	(11,588)				(11,588)
Net derivatives losses on interest rate swaps, net of tax	184			184
Employee stock purchase and option plans	1,427	1	1,426
Employee stock purchase and option plans, Shares		139,228
Shares withheld for taxes on share-based payment awards	(3,092)		(3,092)
Shares withheld for taxes on share-based payment awards, shares		(62,543)
Stock-based compensation	3,146		3,146
Stock-based compensation, Shares		67,445
Repurchases of convertible notes	(500)		(500)
Ending Balance at Dec. 31, 2011	92,499	156	99,885		(7,542)
Ending Balance, Shares at Dec. 31, 2011		15,602,132
Net income (loss)	2,720				2,720
Employee stock purchase and option plans	822	2	820
Employee stock purchase and option plans, Shares		234,552
Shares withheld for taxes on share-based payment awards	(5,524)	1	(5,525)
Shares withheld for taxes on share-based payment awards, shares		(37,151)
Stock-based compensation	3,469		3,469
Stock-based compensation, Shares		149,215
Common stock issued upon conversion of notes		11	(11)
Common stock issued upon conversion of notes ,Shares		1,061,745
Ending Balance at Dec. 31, 2012	93,986	170	98,638		(4,822)
Ending Balance, Shares at Dec. 31, 2012		17,010,493
Net income (loss)	34,598				34,598
Employee stock purchase and option plans	4,032	3	4,029
Employee stock purchase and option plans, Shares		271,335
Shares withheld for taxes on share-based payment awards	(6,277)		(6,277)
Shares withheld for taxes on share-based payment awards, shares		(29,365)
Stock-based compensation	3,811		3,811
Stock-based compensation, Shares		46,599
Excess tax benefits from stock compensation	1,466		1,466
Shares repurchased under our publicly announced share repurchase programs	(25,000)					(25,000)
Shares repurchased under our publicly announced share repurchase programs, shares		(561,255)				561,255
Ending Balance at Dec. 31, 2013	$ 106,616	$ 173	$ 101,667		$ 29,776	$ (25,000)
Ending Balance, Shares at Dec. 31, 2013		16,737,807				561,255