Earning Per Common Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Common Share [Abstract]
Income from continuing operations	$ 6,643	$ 8,463	[1]	$ (3,321)	[2]	$ 2,979	$ 5,817	$ 9,351	$ 6,294	$ 605	$ 14,764	$ 22,067	$ 20,006
Income from discontinued operations	22	(238)	[1]	1,250	[2]	390	286	389	229	(76)	1,424	828	486
Net Income	$ 6,665	$ 8,225	[1]	$ (2,071)	[2]	$ 3,369	$ 6,103	$ 9,740	$ 6,523	$ 529	$ 16,188	$ 22,895	$ 20,492
Weighted average shares											10,124,000	10,209,000	10,219,000
Denominator for basic earnings per common share											10,124,000	10,209,000	10,219,000
Employee stock options											16,000	29,000	67,000
Other stock compensation plans											94,000	74,000	62,000
Dilutive potential common shares											110,000	103,000	129,000
Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversions											10,234,000	10,312,000	10,348,000
Basic earnings per common share: From continuing operations	$ 0.650	$ 0.830	[1]	$ (0.330)	[2]	$ 0.300	$ 0.58	$ 0.92	$ 0.61	$ 0.06	$ 1.46	$ 2.16	$ 1.96
Basic earnings per common share: From discontinued operations		$ (0.020)	[1]	$ 0.120	[2]	$ 0.040	$ 0.03	$ 0.04	$ 0.02	$ (0.01)	$ 0.14	$ 0.08	$ 0.05
Basic Earnings Per Common Share	$ 0.660	$ 0.810	[1]	$ (0.200)	[2]	$ 0.330	$ 0.61	$ 0.96	$ 0.63	$ 0.05	$ 1.60	$ 2.24	$ 2.01
Diluted earnings per common share: From continuing operations	$ 0.650	$ 0.830	[1]	$ (0.330)	[2]	$ 0.290	$ 0.57	$ 0.91	$ 0.60	$ 0.06	$ 1.44	$ 2.14	$ 1.93
Diluted earnings per common share: From discontinued operations		$ (0.020)	[1]	$ 0.120	[2]	$ 0.040	$ 0.03	$ 0.04	$ 0.02	$ (0.01)	$ 0.14	$ 0.08	$ 0.05
Diluted Earnings Per Common Share	$ 0.650	$ 0.810	[1]	$ (0.200)	[2]	$ 0.320	$ 0.60	$ 0.95	$ 0.63	$ 0.05	$ 1.58	$ 2.22	$ 1.98
Dividends paid per common share	$ 0.025	$ 0.025	[1]	$ 0.025	[2]	$ 0.025	$ 0.025	$ 0.025	$ 0.050		$ 0.10	$ 0.10
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount											0	0	0

[1] Includes a pre-tax loss of approximately $315,000 from the Company’s sale of Precise

[2] Includes a pre-tax gain of approximately $3,508,000 from the Company’s sale of SSD.