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Employee Compensation and Benefit Plans - Schedule of Stock Unit Activity (Details) - Stock Units - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested at beginning of year (in shares) 177,275 196,453 183,595
Granted (in shares) 150,000 83,797 120,625
Vested (in shares) (62,954) (75,846) (53,124)
Forfeited/Cancelled (in shares) (2,674) (27,129) (54,642)
Unvested at end of year (in shares) 261,647 177,275 196,453
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Unvested at beginning of year (in dollar per share) $ 39.45 $ 56.25 $ 55.35
Granted (in dollar per share) 8.78 30.00 53.55
Vested (in dollar per share) 42.25 46.20 41.70
Forfeited/Canceled (in dollar per share) 26.85 143.70 68.55
Unvested at end of year (in dollar per share) $ 21.74 $ 39.45 $ 56.25