Retirement Plans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012 Numbers	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Concentration of Risk, Cash and Cash Equivalents	$ 400,000
Fair Value, Concentration of Risk, Notes Receivable	3,200,000
Fair Value, Concentration of Risk, Equity Method Investments	6,200,000
Favorable Rate of Return Equal to or Greater than Average Inflation Rate	5.00%
Investment Objective Achievement Period	60 years
Investment Objective Targeted Equity Portfolio (In Index)	500
Long-term Rate on Assets Assumption	6.50%
Single Stock Issue Restricted Among Total Portfolio Value	5.00%
Securities Held in Mutual or Commingled Funds	90.00%
Net periodic pension cost	462,000	306,000	329,000
Interest cost on projected benefit obligation	(564,000)	(609,000)	(651,000)
Defined Benefit Plan, Expected Return on Plan Assets	(584,000)	(590,000)	(546,000)
Defined Contribution Plan, Employer Discretionary Contribution Amount	100,000	200,000	200,000
Equity Securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	75.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	45.00%
Defined Benefit Cash Balance Plan During 2013 [Member]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	400,000
Net periodic pension cost	400,000
Interest cost on projected benefit obligation	500,000
Defined Benefit Plan, Expected Return on Plan Assets	(600,000)
Defined Benefit Plan, Amortization of Gains (Losses)	$ 500,000
Standard Commercial Business Unit [Member] | Defined Benefit Cash Balance Plan During 2013 [Member]
Defined Benefit Plan, Service Rendered by Employees	1,000 hours