Pension Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Pension Plan (Details) [Line Items]
Defined Benefit Plan, Vesting Periods	5 years
Defined Benefit Plan, Funded Status of Plan	$ (4,424,000)	$ (5,324,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.00%	8.00%
Defined Benefit Plan, Future Amortization of Gain (Loss)	$ 217,000
Defined Benefit Plan, Accumulated Benefit Obligation	13,400,000	$ 13,500,000
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	660,000
Defined Benefit Pension Plan, Liabilities, Noncurrent	3,800,000
Increase (Decrease) in Deferred Pension Costs	1,072,000	$ 485,000
Defined Benefit Plan, Expected Contributions in Current Fiscal Year	1,000,000
Pension Contributions	314,000
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	660,000
Other Postretirement Benefits Payments	500,000
Two Thousand Nine Plan [Member]
Pension Plan (Details) [Line Items]
Increase (Decrease) in Deferred Pension Costs	285,000
Two Thousand Ten Plan [Member]
Pension Plan (Details) [Line Items]
Increase (Decrease) in Deferred Pension Costs	559,000
Two Thousand Twelve Plan [Member]
Pension Plan (Details) [Line Items]
Increase (Decrease) in Deferred Pension Costs	669,000
Payments for Postemployment Benefits	520,000
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Year Two	$ 149,000