Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Shares Outstanding	Treasury Shares	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2012	$ 99,093	$ 32	$ (50,103)	$ 199,331	$ (45,263)	$ (4,904)
Beginning Balance (in shares) at Dec. 31, 2012		32,345
Net income	55,653				55,653
Dividend payment	(45,922)				(45,922)
Foreign currency translation	4,904					$ 4,904
Tax benefit (deficiency) associated with share-based payments	(1,165)			(1,165)
Exercise of stock options (in shares)		206
Exercise of stock options	468			468
Repurchase of common stock (in shares)		(268)
Repurchase of common stock	(1,565)		(1,565)
Non-cash share based compensation expense	6,163			6,163
Activity related to non-vested shares (in shares)		(68)
Activity related to non-vested shares	(808)			(808)
Ending Balance at Dec. 31, 2013	116,821	$ 32	(51,668)	203,989	(35,532)
Ending Balance (in shares) at Dec. 31, 2013		32,215
Net income	38,523				38,523
Dividend payment	(14,940)				(14,940)
Tax benefit (deficiency) associated with share-based payments	$ (1,992)			(1,992)
Exercise of stock options (in shares)	1,096	1,096
Exercise of stock options	$ 12,476	$ 1		12,475
Non-cash share based compensation expense	4,269			4,269
Activity related to non-vested shares (in shares)		147
Activity related to non-vested shares	(1,113)			(1,113)
Ending Balance at Dec. 31, 2014	$ 154,044	$ 33	(51,668)	217,628	(11,949)
Ending Balance (in shares) at Dec. 31, 2014	33,458	33,458
Net income	$ 38,129				38,129
Dividend payment	(20,187)				(20,187)
Tax benefit (deficiency) associated with share-based payments	$ 1,601			1,601
Exercise of stock options (in shares)	320	320
Exercise of stock options	$ 2,211	$ 1		2,210
Non-cash share based compensation expense	5,222			5,222
Activity related to non-vested shares (in shares)		113
Activity related to non-vested shares	(1,187)			(1,187)
Ending Balance at Dec. 31, 2015	$ 179,833	$ 34	$ (51,668)	$ 225,474	$ 5,993
Ending Balance (in shares) at Dec. 31, 2015	33,458	33,891