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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 16, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Feb. 28, 2021
Fair Value by Fair Value Hierarchy Level [Line Items]            
Gain (loss) due to change in the fair value, included in earnings   $ 1,100,000 $ 0 $ 7,600,000 $ 0  
Embedded derivative $ 17,800,000         $ 5,600,000
Amended Revolving Credit Facility | Affiliate Of KKR Denali            
Fair Value by Fair Value Hierarchy Level [Line Items]            
Decrease in the variable interest rate margin 0.25%          
Fair Value, Inputs, Level 1            
Fair Value by Fair Value Hierarchy Level [Line Items]            
Unrealized gain (loss) due to change in fair value of marketable securities   (600,000)   $ 4,700,000    
Convertible security            
Fair Value by Fair Value Hierarchy Level [Line Items]            
Gain (loss) due to change in the fair value, included in earnings   $ (1,800,000)