Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
(Benefit) provision for income taxes	$ (12,400)	$ 28,802	$ (12,142)	$ 5,518
Effective income tax rate	13.60%	38.40%	10.80%	17.10%
Benefits of future tax deductions for amortization	$ 38,100		$ 38,100
Unrecognized tax benefits	87,900		87,900		$ 90,300
Decrease in unrecognized tax benefits is reasonably possible	$ 7,800		$ 7,800