Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 23,835	$ 32,816	$ 61,612	$ 89,518
Effective Income Tax Rate Reconciliation, Percent	27.20%	28.00%	25.80%	28.40%
U.S federal statutory rate, percent			21.00%	21.00%
Income tax benefit related to federal and state income tax filings for prior year	$ 500
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options			$ 2,000
Income tax benefit from a change in state tax rate			3,000
Charge related to certain income tax matters			$ 1,000
Write-off of unrealized deferred tax asset		$ 1,000		$ 3,000