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Fair Value Measurements - Quantitative information about the significant unobservable inputs (Details)
6 Months Ended
Jun. 30, 2021
USD ($)
Risk Adjusted Discount Rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Basis point for adjustment of discount rate 1
Level 3 | Risk Adjusted Discount Rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Probability (as a percent) 5.83
Basis point for adjustment of discount rate 1
Fair value increase (decrease) $ (341,000)
Level 3 | Risk Adjusted Discount Rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Probability (as a percent) 21.09
Fair value increase (decrease) $ 341,000
Level 3 | Risk Adjusted Discount Rate | Weighted average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Probability (as a percent) 20.36
Level 3 | Sale Proceeds | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Amount of comparable TDPRV $ 67,500,000
Fair value increase (decrease) (1.0)
Level 3 | Sale Proceeds | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Amount of comparable TDPRV 350,000,000.0
Fair value increase (decrease) 7,900,000
Level 3 | Sale Proceeds | Weighted average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Amount of comparable TDPRV $ 100,000,000.0
Level 3 | Timing of Cash Flows | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Probability (as a percent) 0.39
Fair value increase (decrease) $ (224,000)
Level 3 | Timing of Cash Flows | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Probability (as a percent) 41.88
Fair value increase (decrease) $ 2,100,000