CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net earnings	$ 18,466	$ 9,566	$ 40,792	$ 31,931
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(2,201)	(1,693)	(4,453)	(2,424)
Amortization of:
Prior service benefit	(27)	(755)	(85)	(2,264)
Unrecognized loss	676	569	1,806	1,707
Unrecognized actuarial gains	0	0	421	150
Foreign currency exchange rate changes	(53)	(22)	(20)	(47)
Income tax (expense) benefit related to pension and postretirement plans	(264)	68	(872)	143
Pension and postretirement plans, net of tax	332	(140)	1,250	(311)
Total other comprehensive income (loss), net of tax	(1,869)	(1,833)	(3,203)	(2,735)
Comprehensive income	$ 16,597	$ 7,733	$ 37,589	$ 29,196