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Earnings Per Share - Share Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted average number of shares outstanding, basic [1] 16,569,000 16,533,000 16,487,000
Weighted average number of shares outstanding, diluted 16,724,000 16,533,000 16,487,000
Earnings per share, basic $ 4.65 $ (0.34) $ (8.72)
Earnings per share, diluted $ 4.61 $ (0.34) $ (8.72)
Anti-dilutive shares excluded from calculation 500,000 1,000,000.0 900,000
Restricted Stock Units (RSUs) [Member]      
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 141,000 0 0
Performance Shares [Member]      
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 14,000 0 0
[1] Basic average common shares outstanding include restricted stock awards that are fully vested, but are deferred for future issuance. See Note 15 "Stockholders' Equity" for further discussion.