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Income Taxes and Related Payments - Reconciliation of effective tax rate (Details) | 12 Months Ended
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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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