Consolidated Statements of Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2008	$ 229	$ 130,289	$ (5,975)	$ 296,204	$ (251,664)	$ 169,083
Balance (in Shares) at Dec. 31, 2008	22,879
Net income				37,992		37,992
Foreign currency translation adjustment			3,424			3,424
Comprehensive income						41,416
Purchase of treasury shares					(2,661)	(2,661)
Tax benefit from exercise of stock options		26				26
Stock-based compensation		8,139				8,139
Forfeiture of restricted shares of common stock (in Shares)	(6)
Issuance of common shares in connection with exercise of share options	1	1,123				1,124
Shares of common stock issued in connection with exercise of share options (in Shares)	61
Issuance of restricted common shares	2	(2)
Shares of restricted common shares issued (in Shares)	272
Balance at Dec. 31, 2009	232	139,575	(2,551)	334,196	(254,325)	217,127
Balance (in Shares) at Dec. 31, 2009	23,206
Net income				44,323		44,323
Foreign currency translation adjustment			(852)			(852)
Comprehensive income						43,471
Purchase of treasury shares					(6,621)	(6,621)
Tax benefit from exercise of stock options		231				231
Stock-based compensation		8,838				8,838
Forfeiture of restricted shares of common stock (in Shares)	(11)
Issuance of common shares in connection with exercise of share options	1	1,758				1,759
Shares of common stock issued in connection with exercise of share options (in Shares)	85
Issuance of restricted common shares	3	(3)
Shares of restricted common shares issued (in Shares)	335
Balance at Dec. 31, 2010	236	150,399	(3,403)	378,519	(260,946)	264,805
Balance (in Shares) at Dec. 31, 2010	23,615					23,615
Net income				50,935		50,935
Foreign currency translation adjustment			(191)			(191)
Comprehensive income						50,744
Purchase of treasury shares					(12,455)	(12,455)
Tax benefit from exercise of stock options		121				121
Stock-based compensation		10,477				10,477
Forfeiture of restricted shares of common stock (in Shares)	(7)
Shares to Ideal Image	1	5,659				5,660
Shares to Ideal Image (in Shares)	125
Issuance of common shares in connection with exercise of share options	1	2,677				2,678
Shares of common stock issued in connection with exercise of share options (in Shares)	99
Issuance of restricted common shares	3	(3)
Shares of restricted common shares issued (in Shares)	244
Correction of prior period shares issued	(9)	9
Correction of prior period shares issued (in Shares)	(923)
Balance at Dec. 31, 2011	$ 232	$ 169,339	$ (3,594)	$ 429,454	$ (273,401)	$ 322,030
Balance (in Shares) at Dec. 31, 2011	23,153					23,153