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]
Provision for income taxes	$ 8,448	$ 10,074	$ 18,422	$ 17,192
Gross unrecognized tax benefits	$ 21,500		21,500
Possible future income tax benefit resulting from recognition of unrecognized tax benefits			$ 16,000