Stockholders' Equity and Earnings Per Share (Weighted Average Number of Shares Outstanding Reconciliation) (Details) - $ / shares	3 Months Ended				12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Basic weighted average shares outstanding (in shares)					13,657,000	13,690,000	13,699,000
Dilutive effect of share-based compensation awards (in shares)					55,000	36,000	32,000
Diluted weighted average shares outstanding (in shares)					13,712,000	13,726,000	13,731,000
Basic earnings (loss) per share:
Continuing operations (in dollars per share)	$ 1.41	$ (0.15)	$ 0.59	$ (0.10)	$ 1.76	$ 1.10	$ 1.68
Discontinued operations (in dollars per share)	(0.03)	0	(0.02)	1.68	1.62	(2.09)	(0.39)
Basic earnings (loss) per share (in dollars per share)	1.39	(0.15)	0.57	1.58	3.39	(0.99)	1.29
Diluted earnings (loss) per share:
Continuing operations (in dollars per share)	1.40	(0.15)	0.59	(0.10)	1.76	1.10	1.68
Discontinued operations (in dollars per share)	(0.03)	0	(0.02)	1.68	1.62	(2.09)	(0.39)
Diluted earnings (loss) per share (in dollars per share)	$ 1.37	$ (0.15)	$ 0.57	$ 1.58	$ 3.37	$ (0.99)	$ 1.29