Income Taxes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ (9,233,000)	$ 14,076,000
Excess tax benefit		$ 28,800,000
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits	29,900,000
Income tax benefit resulting from unrecognized tax benefits recognized in future periods	16,900,000
Minimum
Income Tax Contingency [Line Items]
Reduction in unrecognized tax benefit recorded	0
Maximum
Income Tax Contingency [Line Items]
Reduction in unrecognized tax benefit recorded	$ 3,700,000