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Equity (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchase of Class A Common Stock   $ 300,000 $ 3,100,000 $ 300,000
2019 Share Repurchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share repurchase program, authorized percentage of outstanding Class A Common Stock held by non-affiliates 10.00%      
Stock repurchase program, number of shares authorized to be repurchased (in shares) 580,000      
Stock repurchase program, authorized amount $ 5,000,000.0      
Duration of share repurchase program 12 months      
Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchase of Class A Common Stock (in shares)     344,827  
Repurchase of Class A Common Stock     $ 2,400,000  
Class A Common Stock | 2019 Share Repurchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchase of Class A Common Stock (in shares)     93,063 47,474
Repurchase of Class A Common Stock     $ 700,000 $ 300,000
Restricted Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares issued (in shares)     649,039 580,091
Value of shares granted     $ 2,500,000 $ 4,400,000
Unrecognized expense     $ 4,100,000  
Weighted average period     1 year 9 months 18 days  
PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     3 years  
Market Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares issued (in shares)     121,262 105,920
Unrecognized expense     $ 1,100,000  
Weighted average period     1 year 7 months 6 days  
Market Based Restricted Stock Units, Relative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of target shares granted to employees (in dollars per share)     $ 6.33 $ 11.96
Market Based Restricted Stock Units, Absolute        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of target shares granted to employees (in dollars per share)     $ 3.62 $ 9.50
Master reorganization agreement | CSL energy holdings I LLC and CSL energy holdings II LLC        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Company and CSL energy holdings I, LLC   $ 3,000,000.0   $ 3,000,000.0
Master reorganization agreement | Class A Common Stock | CSL energy holdings I LLC and CSL energy holdings II LLC        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued (in shares)       206,897