Stockholders' Equity and Earnings Per Share (Weighted Average Number of Shares Outstanding Reconciliation) (Details) - $ / shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Basic weighted average shares outstanding (in shares)									6,830	6,818	7,001
Dilutive effect of restricted stock awards (in shares)									43	36	21
Diluted weighted average shares outstanding (in shares)									6,873	6,854	7,022
Basic earnings per share:
Continuing operations (USD per share)	$ 1.41	$ 0.49	$ 1.06	$ 1.21	$ (0.68)	$ (0.31)	$ 0.28	$ 1.13	$ 4.17	$ 0.43	$ 0.32
Discontinued operations (USD per share)	0.07	0.74	(0.06)	(0.48)	4.24	0.25	0.17	(0.72)	0.27	3.91	2.82
Basic earnings per share (USD per share)	1.48	1.23	1.00	0.73	3.56	(0.06)	0.45	0.41	4.44	4.34	3.14
Diluted earnings per share:
Continuing operations (USD per share)	1.40	0.49	1.06	1.20	(0.68)	(0.31)	0.28	1.13	4.14	0.43	0.32
Discontinued operations (USD per share)	0.07	0.74	(0.06)	(0.47)	4.21	0.25	0.17	(0.72)	0.27	3.89	2.81
Diluted earnings per share (USD per share)	$ 1.47	$ 1.23	$ 1.00	$ 0.73	$ 3.53	$ (0.06)	$ 0.45	$ 0.41	$ 4.41	$ 4.32	$ 3.13