CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings	$ 89,600	$ 126,256	$ 106,785
Cash flow hedges adjustment, net of tax of $10, $89 and $61, respectively	(584)	(249)	(160)
Pension adjustment, net of tax of $778, $785 and $613, respectively	2,228	1,856	777
Foreign currency translation on net investment hedges	(28,871)	6,989	7,542
Tax effect of current year activity on net investment hedges	10,812	(2,733)	(2,966)
Foreign currency translation on long-term intercompany loans	7,013	(494)	(10,681)
Reclassification of cumulative translation to net earnings	6,782	(3,257)	0
Other foreign currency translation	66,751	(45,515)	(79,446)
Total comprehensive income	$ 153,731	$ 82,853	$ 21,851