Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ 11,710	$ 26,200	$ (432)	$ 31,719
Effective income tax rate	22.10%	69.00%	(0.30%)	45.20%
Benefits of future tax deductions for amortization			$ 38,100
Unrecognized tax benefits	$ 87,300		87,300		$ 90,300
Decrease in unrecognized tax benefits is reasonably possible	$ 2,800		$ 2,800