Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Income Tax Contingency [Line Items]
Effective income tax rate (as percent)	19.30%	19.50%	15.20%	19.60%
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 0	$ 0	$ 0	$ 0
Unrecognized Tax Benefits	6,900,000		6,900,000		$ 6,900,000
Interest and penalties	$ 0	$ 0	$ 0	$ 0
Effective income tax rate (as percent)	19.30%	19.50%	15.20%	19.60%
Federal and State income tax statutory rate (as percent)			26.14%	26.14%
Excess tax benefit	$ (85,000)	$ 131,000	$ 505,000	$ 832,000
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount			$ 22,400,000