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Equity Method Investments and Membership Interests in Joint Ventures (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2019
Mar. 01, 2017
Knight Hawk | Sale      
Schedule of Equity Method Investments [Line Items]      
Ownership interest sold   1.00%  
Ownership interest sold, value   $ 2.0  
Ownership interest   48.00%  
DTA      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 35.00%   21.875%
Payments to auction house to increase ownership $ 7.2