Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 31,069	$ 19,132	$ 64,964	$ 25,603
Income tax expense using estimated annual effective income tax rate	11,533	6,279	24,143	8,404
Changes in effective tax rates	(78)	(178)	0	0
Impact of discrete items, net	(91)	0	(100)	639
Income tax expense	$ 11,364	$ 6,101	$ 24,043	$ 9,043