Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income before income tax	$ 76,083	$ 25,030
Provision for income taxes	$ (16,587)	$ (8,571)
Effective tax rate (as a percent)	21.80%	34.20%
Unrecognized tax benefits, period increase (decrease)	$ 500
Unrecognized tax benefits approximate amount of estimated reduction within the next twelve months	$ 18,000