Consolidated Statement of Shareholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance, shares at Dec. 31, 2014		31,342				429
Balance, value at Dec. 31, 2014	$ 387,229	$ 313	$ 247,232	$ 154,625	$ (9,551)	$ (5,390)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,596			9,596
Foreign currency translation adjustment	(1,662)				(1,662)
Adjustment to retirement benefit liability, net of taxes of $3	4				4
Adjustment to post employment health care benefit liability, net of taxes of $47	74				74
Reclassification of loss on cash flow hedges, net of tax of $82	143				143
Stock compensation expense	1,406		1,406
Excess tax benefit from stock compensation	37		37
Stock options exercised, shares		14
Stock options exercised	180		180
Issuance of restricted stock, shares		18
Issuance of restricted stock	0
Net settlement of restricted stock units, shares		62				24
Net settlement of restricted stock units	(387)	$ 1	(1)			$ (387)
Balance, shares at Jun. 30, 2015		31,436				453
Balance, value at Jun. 30, 2015	$ 396,620	$ 314	$ 248,854	$ 164,221	$ (10,992)	$ (5,777)