Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 36,624	$ 22,638	$ 73,957	$ 52,684
Foreign currency translation adjustment	38	0	66	0
Other comprehensive income (loss), before tax	38	0	66	0
Income tax expense on other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	38	0	66	0
Comprehensive income	$ 36,662	$ 22,638	$ 74,023	$ 52,684