CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net Income		$ 9,863	$ 24,530
Other comprehensive loss, net of tax:
Foreign currency translation loss	[1]	(136)	(2,406)
Total other comprehensive loss, net of tax		(136)	(2,406)
Comprehensive Income		$ 9,727	$ 22,124

[1] Net of tax benefit of $77 and $1,190 for the three months ended March 31, 2016 and 2015, respectively.