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Stock-Based Compensation - Summary of Phantom Share Activity (Details) - Phantom Stock Plan
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Non-vested at beginning of year, Number of Units | shares 42,800
Vested, Number of Units | shares (5,350)
Cancelled, Number of Units | shares (37,450)
Non-vested at beginning of year, Weighted-average grant-date fair value per share | $ / shares $ 6.39
Vested, Weighted-average grant-date fair value per share | $ / shares 6.39
Cancelled, Weighted-average grant-date fair value per share | $ / shares $ 6.39