Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock (0.01 Par) [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2011	$ 143,394	$ 188	$ 165,519	$ (18,733)	$ (358)	$ (3,222)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,688	0	0	22,688	0	0
Foreign currency translation adjustments	1,411	0	0	0	0	1,411
Repurchases of common stock in the open market	(3,433)	0	0	0	(3,433)	0
Stock-based compensation expense	1,780	0	1,780	0	0	0
Income tax benefit from stock-based compensation	2,034	0	2,034	0	0	0
Shares withheld in exchange for tax withholding payments on stock-based compensation	(2,750)	0	(2,750)	0	0	0
Issuance of stock for employer contributions to retirement plan	1,835	0	538	0	1,297	0
Net issuances of stock pursuant to stock compensation plans and other	378	4	374	0	0	0
Balance at Dec. 31, 2012	167,337	192	167,495	3,955	(2,494)	(1,811)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,756	0	0	23,756	0	0
Foreign currency translation adjustments	197	0	0	0	0	197
Repurchases of common stock in the open market	(1,747)	0	0	0	(1,747)	0
Stock-based compensation expense	1,628	0	1,628	0	0	0
Income tax benefit from stock-based compensation	359	0	359	0	0	0
Shares withheld in exchange for tax withholding payments on stock-based compensation	(623)	0	(977)	0	354	0
Issuance of stock for employer contributions to retirement plan	2,045	0	322	0	1,723	0
Net issuances of stock pursuant to stock compensation plans and other	75	0	(919)	0	994	0
Balance at Dec. 31, 2013	193,027	192	167,908	27,711	(1,170)	(1,614)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,098	0	0	27,098	0	0
Foreign currency translation adjustments	(5,783)	0	0	0	0	(5,783)
Repurchases of common stock in the open market	(66,640)	(21)	(62,927)	0	(3,692)	0
Stock-based compensation expense	2,128	0	2,128	0	0	0
Income tax benefit from stock-based compensation	2,506	0	2,506	0	0	0
Shares withheld in exchange for tax withholding payments on stock-based compensation	(3,407)	0	(3,407)	0	0	0
Issuance of stock for employer contributions to retirement plan	2,469	0	616	0	1,853	0
Net issuances of stock pursuant to stock compensation plans and other	327	0	(2,301)	0	2,628	0
Balance at Dec. 31, 2014	$ 151,725	$ 171	$ 104,523	$ 54,809	$ (381)	$ (7,397)