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Income Taxes and Related Payments - Reconciliation of effective tax rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21.00%	21.00%	35.00%
State and local taxes, net of federal tax effect	2.80%	2.10%	0.90%
Non-deductible share-based compensation	0.00%	0.00%	0.50%
Rate benefit from the flow through entity	(6.70%)	(6.70%)	(6.20%)
Tax Reform - change in federal corporate tax rate	0.00%	0.00%	43.90%
Change in state tax rate	(6.80%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent	0.60%	0.00%	0.00%
Other	(0.60%)	(0.60%)	(0.50%)
Effective tax rate	10.30%	15.80%	73.60%

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Federal, Percent

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