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Post Retirement Benefits - Change in Benefit Obligation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in benefit obligation:      
Interest cost $ 316,000 $ 277,000 $ 332,000
Postretirement benefits      
Change in benefit obligation:      
Benefit obligation at beginning of year 9,172,000 6,774,000  
Interest cost 316,000 277,000  
Unrecognized (gain) loss (48,000) 2,726,000  
Benefits paid (434,000) (605,000)  
Benefit obligation at beginning of year 9,006,000 9,172,000 $ 6,774,000
Plan Assets 0 0  
Amounts recorded in accumulated other comprehensive income:      
Prior service credit (7,594,000) (8,090,000)  
Net loss 3,939,000 4,156,000  
Total $ (3,655,000) $ (3,934,000)  
Weighted-average assumptions:      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.10% 3.80%