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Retirement Plans, Schedule of Change in Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plan [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year $ 354,994 $ 337,176  
Service cost 7,622 10,677 $ 13,402
Interest cost 15,499 13,729 14,123
Actuarial loss (gain) (44,935) 34,563  
Gross benefits paid (11,749) (7,718)  
Curtailments (3,081) (33,433)  
Acquisition 63,133 0  
Benefit obligation at end of year 381,483 354,994 337,176
Accumulated benefit obligation at end of year 356,797 324,904  
SERP [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 1,412 1,457  
Service cost 0 0 0
Interest cost 49 58 65
Actuarial loss (gain) (70) 42  
Gross benefits paid (145) (145)  
Curtailments 0 0  
Acquisition 0 0  
Benefit obligation at end of year 1,246 1,412 1,457
Accumulated benefit obligation at end of year 1,246 1,412  
Other Postretirement Benefits [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 679 675  
Service cost 0 0 0
Interest cost 24 27 29
Actuarial loss (gain) 143 52  
Gross benefits paid (103) (75)  
Curtailments 0 0  
Acquisition 0 0  
Benefit obligation at end of year 743 679 $ 675
Accumulated benefit obligation at end of year $ 743 $ 679