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Commitments and Contingencies - Purchase Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Unrecorded Unconditional Purchase Obligation [Line Items]        
Impact fee expense   $ 649 $ 27,000  
Self Insurance Reserve $ 800     $ 500
Portfolio Energy Credits        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Purchase commitment due in next twelve months 1,700      
Purchase commitment due in two years 1,700      
Purchase commitment due in three years 1,700      
Purchase commitment due in four years 1,700      
Purchase commitment due thereafter 22,500      
Future purchase commitments for the remainder of 2020 1,700      
Licensing Agreements        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Purchase commitment due in next twelve months 200      
Purchase commitment due thereafter 5,200      
Purchase commitment 7,700      
Future purchase commitments for the remainder of 2020 500      
Licensing Agreements        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Purchase commitment due in two years 500      
Purchase commitment due in three years 500      
Purchase commitment due in four years $ 500      
Term of purchase commitment 15 years      
Future purchase commitments for the remainder of 2020 $ 500