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Stockholders' Equity (Deficit) - Number of PSU's Granted Based on Adjusted EBITDA CAGR (Details) - $ / shares
12 Months Ended
Mar. 01, 2020
Feb. 13, 2020
Feb. 12, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Three-year PSU Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
PSU awards performance period       3 years 3 years 3 years
Number of units granted (in shares)       323,135    
granted (in dollars per share)       $ 36.33    
Performance Share Units Awards | Adjusted EBITDA Compound Annual Growth Rate            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of units granted (in shares) 29,690 42,507 35,068      
granted (in dollars per share) $ 30.31 $ 34.40 $ 35.86