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Employee Benefit Plans Assumed Health Care Cost Trend Rates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]    
Effect on total of service and interest cost components, 1% Increase $ 4  
Effect on total of service and interest cost components, 1% Decrease (4)  
Effect on benefit obligation, 1% Increase 79  
Effect on benefit obligation, 1% Decrease $ (74)  
Health Trend Rates For the Subsequent Tenth Year [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 4.50% 4.50%
Minimum [Member] | Health Trend Rates For the Subsequent Nine Years [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 1.29% 1.53%
Maximum [Member] | Health Trend Rates For the Subsequent Nine Years [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 17.92% 6.29%