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Subsequent Events (Details) - Subsequent Event - USD ($)
$ / shares in Units, $ in Millions
Jul. 17, 2019
Jul. 15, 2019
Subsequent Event [Line Items]    
Termination and release agreement and paid   $ 11.2
Common Class A    
Subsequent Event [Line Items]    
Dividends declaration per share of common stock $ 0.18125  
Series A Preferred Stock    
Subsequent Event [Line Items]    
Dividends declaration per share of preferred stock $ 0.546875  
Spark HoldCo    
Subsequent Event [Line Items]    
Distributions to affiliates   $ 16.3