Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common Stock (0.01 Par) [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2010	$ 124,787	$ 187	$ 163,422	$ (36,593)	$ (2)	$ (2,227)
Net income	17,860	0	0	17,860	0	0
Foreign currency translation adjustments	(995)	0	0	0	0	(995)
Repurchases of common stock in the open market	(1,414)	0	0	0	(1,414)	0
Stock-based compensation expense	1,899	0	1,899	0	0	0
Issuance of stock for employer contributions to retirement plan	1,108	0	631	0	477	0
Net issuances of stock pursuant to stock compensation plans and other	149	1	(433)	0	581	0
Balance at Dec. 31, 2011	143,394	188	165,519	(18,733)	(358)	(3,222)
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)
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)