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, 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)
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
Issuance of common shares in connection with exercise of share options (in Shares)	85
Issuance of restricted common shares	3	(3)
Issuance of restricted common shares (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
Net income				50,935		50,935
Foreign currency translation adjustment			(191)			(191)
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
Issuance of common shares in connection with exercise of share options (in Shares)	99
Issuance of restricted common shares	3	(3)
Issuance of restricted common shares (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
Net income				53,102		53,102
Foreign currency translation adjustment			1,648			1,648
Purchase of treasury shares					(35,900)	(35,900)
Tax benefit from exercise of stock options		95				95
Stock-based compensation		8,707				8,707
Issuance of common shares in connection with exercise of share options		577				577
Issuance of common shares in connection with exercise of share options (in Shares)	22					(22)
Issuance of restricted common shares	2	(2)
Issuance of restricted common shares (in Shares)	243
Correction of prior period shares issued	4	(4)
Correction of prior period shares issued (in Shares)	361
Balance at Dec. 31, 2012	$ 238	$ 178,712	$ (1,946)	$ 482,556	$ (309,301)	$ 350,259
Balance (in Shares) at Dec. 31, 2012	23,779					23,779