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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation:      
Income tax expense (benefit) at federal statutory rate 21.00% 21.00% 35.00%
State and local income taxes net of federal tax benefit 1.30% (5.70%)  
Noncontrolling interest and nontaxable income (4.00%) 54.70% (33.20%)
Deferred tax rate changes (0.40%) 37.20%  
Share-based compensation 0.10% 18.30%  
Tax Cuts and Jobs Act of 2017   (7.30%) 30.70%
Nondeductible/nontaxable items 0.80% (3.00%) 1.20%
Income tax expense (benefit) 18.80% 115.20% 33.70%