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
Operating Loss Carryforwards [Line Items]
Income tax provision	$ 31,618	$ 29,711	$ 92,257	$ 76,873
Effective income tax rates	27.90%	27.70%	28.10%	27.70%
Actual income tax rates	27.90%	27.10%	27.90%	27.10%
Unrecognized income tax benefits	$ 0		$ 0		$ 0