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Stock-Based and Other Long-Term Incentive Compensation - Stock Option, Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested stock options (in shares) 0   0
Total unrecognized compensation expense $ 0    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 0 $ 18