CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME [Abstract]
Net (loss) earnings	$ (64,834)	$ 19,197	$ 8,603
Other comprehensive (loss) income:
Currency translation adjustment, net of taxes of ($648), ($194) and ($219)	(9,671)	(9,954)	(11,255)
Unrealized holding (losses) gains on marketable securities arising during the period, net of taxes of ($2), $5 and $90	(10)	5	147
Change in unfunded SERP liability, net of taxes of $71, $2 and ($631), respectively	260	21	(1,485)
Other comprehensive loss	(9,421)	(9,928)	(12,593)
Comprehensive (loss) income	$ (74,255)	$ 9,269	$ (3,990)