Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Common Stock (0.01 Par) [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2009	$ 186	$ 161,975	$ (49,325)	$ 0	$ (1,946)	$ 110,890
Net income	0	0	12,732	0	0	12,732
Foreign currency translation adjustments	0	0	0	0	(281)	(281)
Repurchases of common stock in the open market	0	0	0	(266)	0	(266)
Stock-based compensation expense	0	1,657	0	0	0	1,657
Net issuances of stock pursuant to stock compensation and benefit plans and other	1	(210)	0	264	0	55
Balance at Dec. 31, 2010	187	163,422	(36,593)	(2)	(2,227)	124,787
Net income	0	0	17,860	0	0	17,860
Foreign currency translation adjustments	0	0	0	0	(995)	(995)
Repurchases of common stock in the open market	0	0	0	(1,414)	0	(1,414)
Stock-based compensation expense	0	1,899	0	0	0	1,899
Issuance of stock for employer contributions to retirement plan	0	631	0	477	0	1,108
Net issuances of stock pursuant to stock compensation and benefit plans and other	1	(433)	0	581	0	149
Balance at Dec. 31, 2011	188	165,519	(18,733)	(358)	(3,222)	143,394
Net income	0	0	22,688	0	0	22,688
Foreign currency translation adjustments	0	0	0	0	1,411	1,411
Repurchases of common stock in the open market	0	0	0	(3,433)	0	(3,433)
Stock-based compensation expense	0	1,780	0	0	0	1,780
Income tax benefit from stock-based compensation	0	2,034	0	0	0	2,034
Shares withheld in exchange for tax withholding payments on stock-based compensation	0	(2,750)	0	0	0	(2,750)
Issuance of stock for employer contributions to retirement plan	0	538	0	1,297	0	1,835
Net issuances of stock pursuant to stock compensation and benefit plans and other	4	374	0	0	0	378
Balance at Dec. 31, 2012	$ 192	$ 167,495	$ 3,955	$ (2,494)	$ (1,811)	$ 167,337