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, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted average number of shares outstanding, basic	[1]	16,533,000	16,487,000	16,464,000
Weighted average number of shares outstanding, diluted		16,533,000	16,487,000	16,556,000
Earnings per share, basic		$ (0.34)	$ (8.72)	$ 5.91
Earnings per share, diluted		$ (0.34)	$ (8.72)	$ 5.88
Anti-dilutive shares excluded from calculation		1,000,000	929,399	499,348
Restricted Stock Units (RSUs) [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		0	0	22,000
Performance Shares [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		0	0	45,000
Share-based Payment Arrangement, Option [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		0	0	25,000

[1] Basic average common shares outstanding include restricted stock awards that are fully vested, but are deferred for future issuance. See Note 14 "Stockholders' Equity" for further discussion.