Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock Including Additional Paid in Capital [Member]	Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Accumulated Defined Benefit Plans Adjustment [Member]	Accumulated Translation Adjustment [Member]	Retained Earnings [Member]
Share balance at Dec. 31, 2012		27,295,488
Balance at Dec. 31, 2012	$ 466,905	$ 71,819		$ (5,030)	$ (57,584)	$ 457,700
Net Income	22,824					22,824
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	2,772			2,772
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(521)				(521)
Exercised		198,296
Stock Options Exercised, Value	2,865	$ 2,865
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		82,965
Stock Based Compensation Expense	2,685	$ 2,685
Tax Impact of Stock Options	(899)	$ (899)
Stock Repurchased and Retired During Period, Shares		(421,199)
Stock Repurchased and Retired During Period, Value	(8,133)	$ (1,165)				(6,968)
Cash Dividends Declared	(5,435)					(5,435)
Share balance at Dec. 31, 2013		27,155,550
Balance at Dec. 31, 2013	483,063	$ 75,305		(2,258)	(58,105)	468,121
Net Income	8,803					8,803
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(4,765)		$ (4,765)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	(2,928)			(2,928)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (13,369)				(13,369)
Exercised	453,745	453,745
Stock Options Exercised, Value	$ 7,423	$ 7,423
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		210,512
Stock Based Compensation Expense	2,315	$ 2,315
Tax Impact of Stock Options	(416)	$ (416)
Stock Repurchased and Retired During Period, Shares		(1,089,560)
Stock Repurchased and Retired During Period, Value	(21,790)	$ (3,154)				(18,636)
Cash Dividends Declared	(19,330)					(19,330)
Share balance at Dec. 31, 2014		26,730,247
Balance at Dec. 31, 2014	439,006	$ 81,473	(4,765)	(5,186)	(71,474)	438,958
Net Income	23,944					23,944
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(4,524)		(4,524)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	1,046			1,046
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (16,810)				(16,810)
Exercised	420,642	420,642
Stock Options Exercised, Value	$ 7,265	$ 7,265
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		4,960
Stock Based Compensation Expense	2,807	$ 2,807
Tax Impact of Stock Options	0	$ 0
Stock Repurchased and Retired During Period, Shares		1,056,954
Stock Repurchased and Retired During Period, Value	19,638	$ 3,437				16,201
Cash Dividends Declared	19,184					19,184
Share balance at Dec. 31, 2015		26,098,895
Balance at Dec. 31, 2015	$ 413,912	$ 88,108	$ (9,289)	$ (4,140)	$ (88,284)	$ 427,517