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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net earnings	$ 7,989	$ 15,734
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,219	2,723
Amortization of:
Unrecognized gain	(9)	(59)
Income tax expense related to pension and postretirement plans	4	24
Pension and postretirement plans, net of tax	(5)	(35)
Total other comprehensive income, net of tax	2,214	2,688
Comprehensive income	$ 10,203	$ 18,422

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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