Condensed Consolidated Statement of Shareholders' Equity Condensed Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]	AOCI Attributable to Parent [Member]
Common stock	$ 304,777
Additional contributed capital	41,084
Retained earnings	420,160
Accumulated other comprehensive loss	(78,960)			$ 184	$ (78,960)
Treasury Stock, Value	(343,256)
Stockholders' Equity Attributable to Parent	$ 343,805
Common Stock, Dividends, Per Share, Declared	$ 0.04
Net earnings	$ 11,548
Other Comprehensive Income (Loss), Net of Tax	807
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	1,107
Cumulative translation adjustment, net of tax	243
Dividends	(1,320)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(1,423)	$ 945	$ (2,368)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	965		965
Common stock	305,722
Additional contributed capital	39,681
Retained earnings	430,388
Accumulated other comprehensive loss	(76,803)			991	(76,803)
Treasury Stock, Value	(343,256)
Stockholders' Equity Attributable to Parent	355,732
Common stock	306,697
Additional contributed capital	42,820
Retained earnings	478,847
Accumulated other comprehensive loss	(97,739)			1,018	(97,739)
Treasury Stock, Value	(352,696)
Stockholders' Equity Attributable to Parent	$ 377,929
Treasury Stock, Shares, Acquired	31,500
Common Stock, Dividends, Per Share, Declared	$ 0.04
Net earnings	$ 11,419
Other Comprehensive Income (Loss), Net of Tax	78
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	1,022
Cumulative translation adjustment, net of tax	91
Dividends	(1,315)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(2,636)	$ 967	(3,603)
Treasury Stock, Value, Acquired, Cost Method	(849)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	1,154		$ 1,154
Common stock	307,664
Additional contributed capital	40,371
Retained earnings	488,951
Accumulated other comprehensive loss	(96,548)			$ 1,096	$ (96,548)
Treasury Stock, Value	(353,545)
Stockholders' Equity Attributable to Parent	$ 386,893