Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current [Abstract]
Federal	$ 4,532	$ 16,959	$ 10,355
State	5,997	5,687	2,698
Deferred [Abstract]
Federal	9,392	7,280	15,647
State	2,348	1,820	2,353
Income tax provision excluding deferred tax asset revaluation and reversal of valuation allowance	22,269	31,746	31,053
Deferred tax expense (benefit) - re-measurement of deferred tax assets	0	25,619	0
Deferred tax expense (benefit) - reversal of valuation allowance	0	(8,650)	0
Income tax provision	$ 22,269	$ 48,715	$ 31,053