Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 21,187		$ 17,405
Unrealized gains on derivative instruments, net of income tax expense of $87 and $0, respectively	150		0
Foreign currency translation adjustments	4,846	[1]	5,336
Comprehensive income	$ 26,183		$ 22,741

[1] Income taxes are not provided for foreign currency translation adjustments relating to investments in international subsidiaries that are intended to be held indefinitely.