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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net earnings	$ 15,945	$ 17,764	$ 23,934	$ 33,498
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(5,935)	2,733	(3,716)	5,456
Amortization of:
Unrecognized gain	(12)	(271)	(21)	(330)
Unrecognized actuarial gains	12	472	12	472
Income tax related to pension and postretirement plans	0	(81)	4	(57)
Pension and postretirement plans, net of tax	0	120	(5)	85
Total other comprehensive income (loss), net of tax	(5,935)	2,853	(3,721)	5,541
Comprehensive income	$ 10,010	$ 20,617	$ 20,213	$ 39,039

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