Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other comprehensive (loss) income:
Foreign currency translation	$ 1,208	$ (3,854)	$ 1,422	$ (2,879)
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $413, $(185), $503 and $(459)	(1,240)	554	(1,509)	1,378
Total other comprehensive (loss)	(32)	(3,300)	(87)	(1,501)
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 131,358	$ 113,749	$ 163,940	$ 146,887