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Stock-Based Compensation - Summary of Unit Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted shares      
Units      
Outstanding at beginning of year (in shares) 17,000 21,000 17,000
Granted (in shares) 251,000 17,000 14,000
Vested (in shares) (33,000) (16,000) (9,000)
Forfeited (in shares) (4,000) (5,000) (1,000)
Outstanding at end of year (in shares) 231,000 17,000 21,000
Weighted Average Price at Grant      
Beginning of year (in dollars per share) $ 306.10 $ 586.00 $ 656.00
Granted (in dollars per share) 25.38 115.50 536.00
Vested (in dollars per share) 126.09 462.50 650.00
Forfeited (in dollars per share) 76.73 348.90 582.00
End of year (in dollars per share) $ 30.76 $ 306.10 $ 586.00
Performance shares      
Units      
Outstanding at beginning of year (in shares) 13,000 16,000 8,000
Granted (in shares) 134,000 7,000 8,000
Forfeited (in shares) 0 (7,000) 0
Canceled (in shares) (8,000) (3,000) 0
Outstanding at end of year (in shares) 139,000 13,000 16,000
Weighted Average Price at Grant      
Beginning of year (in dollars per share) $ 377.90 $ 582.00 $ 631.00
Granted (in dollars per share) 29.70 80.00 536.00
Forfeited (in dollars per share) 0 458.30 0
Canceled (in dollars per share) 627.36 585.00 0
End of year (in dollars per share) $ 34.81 $ 377.90 $ 582.00