Consolidated Statements of Shareholders' Equity and Comprehensive Income (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Common Stock in Treasury
Beginning Balance at Dec. 31, 2010	$ 212,477	$ 17	$ 156,310	$ 57,983	$ 7,242	$ (9,075)
Beginning Balance (in shares) at Dec. 31, 2010		16,254,139
Net income	23,377			23,377
Currency translation adjustment, net of tax	(1,426)				(1,426)
Stock Option Expense	2,767		2,767
Issuance of restricted stock (in shares)		15,039
Issuance of restricted stock	(40)		(40)
Stock options exercised (in shares)		471,697
Stock options exercised	9,150		9,150
Income tax benefit from exercise of stock options	1,593		1,593
Ending Balance at Dec. 31, 2011	247,898	17	169,780	81,360	5,816	(9,075)
Ending Balance (in shares) at Dec. 31, 2011		16,740,875
Net income	22,998			22,998
Currency translation adjustment, net of tax	525				525
Stock Option Expense	4,097		4,097
Issuance of restricted stock (in shares)		14,339
Issuance of restricted stock	(79)		(79)
Stock options exercised (in shares)		258,430
Stock options exercised	6,162	1	6,161
Income tax benefit from exercise of stock options	1,135		1,135
Ending Balance at Dec. 31, 2012	282,736	18	181,094	104,358	6,341	(9,075)
Ending Balance (in shares) at Dec. 31, 2012		17,013,644
Net income	21,509			21,509
Currency translation adjustment, net of tax	925				925
Stock Option Expense	4,421		4,421
Issuance of restricted stock (in shares)		17,441
Issuance of restricted stock	(54)		(54)
Stock options exercised (in shares)	197,052	197,052
Stock options exercised	5,444		5,444
Income tax benefit from exercise of stock options	969		969
Ending Balance at Dec. 31, 2013	$ 315,950	$ 18	$ 191,874	$ 125,867	$ 7,266	$ (9,075)
Ending Balance (in shares) at Dec. 31, 2013		17,228,137