Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 8,805	$ 19,983	$ 15,817	$ 39,243
Other comprehensive income (loss), net of reclassification adjustments and taxes:
Unrealized losses on interest rate swap contracts	0	0	0	(420)
Foreign currency translation adjustments	3,510	(2,825)	(733)	(3,127)
Other comprehensive income (loss)	3,510	(2,825)	(733)	(3,547)
Comprehensive income	$ 12,315	$ 17,158	$ 15,084	$ 35,696