Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 25,043	$ 26,456
Other comprehensive income (loss):
Foreign currency translation adjustments	3,482	(4,759)
Total other comprehensive (loss) income	3,482	(4,759)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	28,525	21,697
Net Income (Loss) Attributable to Noncontrolling Interest	(667)	248
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 29,192	$ 21,449