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Stock-Based Compensation - Summary of Phantom Share Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vested, Number of Units 0  
Phantom Stock Plan    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Non-vested at beginning of year, Number of Units 43 109
Granted, Number of Units   6
Vested, Number of Units (6) (71)
Forfeited, Number of Units   (1)
Cancelled, Number of Units (37)  
Non-vested at end of the period, Number of Units   43
Non-vested at beginning of year, Weighted-average grant-date fair value per share $ 6.39 $ 6.39
Granted, Weighted-average grant-date fair value per share   10.80
Vested, Weighted-average grant-date fair value per share 6.39 6.75
Forfeited, Weighted-average grant-date fair value per share   6.39
Cancelled, Weighted-average grant-date fair value per share $ 6.39  
Non-vested at end of period, Weighted-average grant-date fair value per share   $ 6.39