Pension Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2010
Pension Plan (Details) [Line Items]
Defined Benefit Plan, Funded Status of Plan	$ (6,430,000)	$ (5,915,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.00%	8.00%
Defined Benefit Plan, Amortization of Net Gains (Losses)	6,361,000	5,852,000
Defined Benefit Pension Plan, Liabilities, Noncurrent	5,000,000
Deferred Tax Liabilities, Deferred Expense			285,000	559,000
Defined Benefit Plan, Contributions by Employer	559,000	604,000
Defined Benefit Plan, Other Costs			500,000
Pension Plans, Defined Benefit [Member]
Pension Plan (Details) [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.00%
Defined Benefit Plan, Amortization of Net Gains (Losses)	523,000
Defined Benefit Plan, Accumulated Benefit Obligation	12,400,000	11,300,000
Defined Benefit Plans Estimated Future Employer Contributions In Next Fiscal Year	1,400,000
2013 Plan [Member]
Pension Plan (Details) [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 218,000