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Pension and Other Postretirement Benefits (Details 12) - Other postretirement benefit plans [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Ultimate health care cost trend rate 4.50%  
Health care cost trend rate assumed 6.44% 6.65%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]    
One Percentage Point Increase, Effect on postretirement benefit oblilgation $ 319  
One Percentage Point Decrease, Effect on postretirement benefit oblilgation (295)  
One Percentage Point Increase, Effect on postretirement benefit cost 14  
One Percentage Point Decrease, Effect on postretirement benefit cost $ (13)