Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 29,991	$ 17,709	$ 17,151
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	(862)	(1,252)	(2,743)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	3,606	2,706	1,940
Write-off of state net operating losses	0	1,063	283
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	0	(1,063)	(283)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	(8,088)	0	0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	369	864	788
Total income tax expense	$ 25,016	$ 20,027	$ 17,136
Effective Income Tax Rate Reconciliation, Percent	17.50%	23.70%	21.00%