Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net (loss) earnings available to common stockholders	$ (6,490)	$ 11,352	$ (2,391)	$ 16,684
Other comprehensive (loss) income:
Currency translation adjustment, net of taxes	(2,561)	(1,032)	(2,854)	(4,463)
Unrealized losses on marketable securities arising during the period, net of taxes		(170)		(201)
Change in unfunded SERP liability, net of taxes	37	85	111	256
Other comprehensive loss	(2,524)	(1,117)	(2,743)	(4,408)
Comprehensive (loss) income	$ (9,014)	$ 10,235	$ (5,134)	$ 12,276