Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Computed at federal statutory rate	$ 21,916	$ 11,134	$ 13,949
State and local tax expense, net of federal benefit	3,625	2,367	2,226
Net permanent deduction and credit tax benefits from current year	(1,166)	(1,143)	(1,513)
Net uncertain tax positions excluding current permanent deduction and credit benefits	(937)	(3,756)	(373)
Subsidiary basis write off	0	(3,423)	0
Equity compensation net tax windfall	(8,634)	(2,890)	0
State tax apportionment changes	0	(3,737)	0
Disallowed executive compensation	1,750	682	0
Tax Reform - revaluation of deferrals	0	0	(15,130)
Acquisition adjustments	0	(1,226)	(1,003)
Acquisition costs	245	0	697
Other, net	339	20	948
Total income tax expense	$ 17,138	$ (1,972)	$ (199)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Computed at federal statutory rate (as a percent)	21.00%	21.00%	35.00%
State and local tax expense, net of federal benefit (as a percent)	3.40%	4.50%	5.60%
Net permanent deduction and credit tax benefits from current year (as a percent)	(1.10%)	(2.20%)	(3.80%)
Net uncertain tax positions excluding current permanent deduction and credit benefits (as a percent)	(0.80%)	(7.00%)	(0.90%)
Subsidiary basis write off (as a percent)	0.00%	(6.50%)	0.00%
Equity compensation net tax windfall (as a percent)	(8.30%)	(5.50%)	0.00%
State tax apportionment changes (as a percent)	0.00%	(7.00%)	0.00%
Disallowed executive compensation (as a percent)	1.60%	1.30%	0.00%
Tax Reform - revaluation of deferrals	0.00%	0.00%	(38.00%)
Acquisition adjustments (as a percent)	0.00%	(2.30%)	(2.50%)
Acquisition costs (as a percent)	0.30%	0.00%	1.70%
Other, net (as a percent)	0.30%	0.00%	2.40%
Total income tax expense (as a percent)	16.40%	(3.70%)	(0.50%)