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Employee Benefit Plans Employee Benefit Plans 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year $ 207,690 $ 180,364  
Service cost 5,342 4,999 $ 5,094
Interest cost 7,646 7,904 7,910
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 3,626 0  
Actuarial (gain) loss (21,717) 20,397  
Benefits/expenses paid (6,505) (5,974)  
Projected benefit obligation at end of year 196,082 207,690 180,364
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 173,648 150,872  
Actual return on plan assets (10,626) 22,246  
Employer contributions 6,012 6,504  
Benefits/expenses paid (6,505) (5,974)  
Fair value of plan assets at end of year 162,529 173,648 150,872
Funded Status:      
Net amount recognized as accrued pension cost (33,553) (34,042)  
Postemployment Retirement Benefits [Member]      
Change in Projected Benefit Obligation:      
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0  
Post-Retirement Medical Benefits      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year 8,491 8,802  
Service cost 218 227 247
Interest cost 292 324 371
Actuarial (gain) loss (701) (355)  
Benefits/expenses paid (414) (507)  
Projected benefit obligation at end of year 7,886 8,491 8,802
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 11,053 10,538  
Actual return on plan assets (629) 1,022  
Employer contributions 0 0  
Benefits/expenses paid (414) (507)  
Fair value of plan assets at end of year 10,010 11,053 $ 10,538
Funded Status:      
Net amount recognized as accrued pension cost $ 2,124 $ 2,562