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Pension and Other Postretirement Benefits (Details 12) - Other postretirement benefit plans [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Ultimate health care cost trend rate 4.50%  
Health care cost trend rate assumed 6.65% 6.88%
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 $ 391  
One Percentage Point Decrease, Effect on postretirement benefit oblilgation (360)  
One Percentage Point Increase, Effect on postretirement benefit cost 17  
One Percentage Point Decrease, Effect on postretirement benefit cost $ (15)