Income Taxes - Provision For Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense
Federal	$ 48,941	$ 63,279	$ 62,216
State	8,966	5,183	8,163
Foreign	1,471	2,000	745
Deferred tax (benefit) expense
Federal	(1,459)	55,007	(25,309)
State	(959)	1,676	(4,250)
Foreign	(57)	(255)	(137)
Income taxes	$ 56,903	$ 126,890	$ 41,428