CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Comprehensive Income (Loss)
Net Income	$ 72,806	$ 58,499
Other comprehensive income, net of tax:
Foreign currency translation	63	95
Reclassification of net losses on derivative instruments	112	113
Total Other Comprehensive Income	175	208
Comprehensive Income	$ 72,981	$ 58,707