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Employment Benefit Plans Postretirement Health Care and Other Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Postemployment Benefits, Period Expense $ 936 $ 5,223 $ 9,465
Unfunded Accumulated Postretirement Benefit Obligations Determined By Company 8,720    
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 170    
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components 11    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation 237    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components $ 17    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.00% 3.50%  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 364    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 364    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 377    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 404    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 429    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 2,464    
Defined Benefit Plan, Benefit Obligation $ 4,402    
Maximum [Member]      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year 5.40%    
Minimum [Member]      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year 4.50%