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Benefit Plans Reconciliation of Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at beginning of year $ 140,164    
Fair value of assets at end of year 133,459 $ 140,164  
Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 196,207 174,097  
Service cost 5,790 4,699 $ 4,447
Interest cost 6,879 6,993 6,830
Expected return on assets 9,255 7,888 7,288
Actuarial loss (14,447) 16,552  
Implicit rate subsidy 0 0  
Benefits paid (6,552) (6,134)  
Benefit obligation at end of year 187,877 196,207 174,097
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at beginning of year 133,360 113,895  
Actual return on plan assets (7,700) 17,298  
Employer contributions 8,502 8,301  
Benefits paid (6,552) (6,134)  
Fair value of assets at end of year 127,610 133,360 113,895
Funded status at end of year (60,267) (62,847)  
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 18,003 16,461  
Service cost 616 529 527
Interest cost 627 634 655
Expected return on assets 450 376 292
Actuarial loss (988) 1,124  
Implicit rate subsidy (207) (196)  
Benefits paid (562) (549)  
Benefit obligation at end of year 17,489 18,003 16,461
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at beginning of year 6,804 5,366  
Actual return on plan assets (262) 736  
Employer contributions 629 702  
Benefits paid (1,322) 0  
Fair value of assets at end of year 5,849 6,804 $ 5,366
Funded status at end of year $ (11,640) $ (11,199)