XML 69 R71.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Employee Benefit Plans Employee Benefit Plans 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year $ 196,082 $ 207,690  
Service cost 4,441 5,342 $ 4,999
Interest cost 8,527 7,646 7,904
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 3,626  
Actuarial (gain) loss 29,784 (21,717)  
Benefits/expenses paid (6,982) (6,505)  
Projected benefit obligation at end of year 231,852 196,082 207,690
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 162,529 173,648  
Actual return on plan assets 33,018 (10,626)  
Employer contributions 3,913 6,012  
Benefits/expenses paid (6,983) (6,505)  
Fair value of plan assets at end of year 192,477 162,529 173,648
Funded Status:      
Net amount recognized as accrued pension cost (39,375) (33,553)  
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 7,886 8,491  
Service cost 186 218 227
Interest cost 285 292 324
Actuarial (gain) loss (538) (701)  
Benefits/expenses paid (424) (414)  
Projected benefit obligation at end of year 7,395 7,886 8,491
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 10,010 11,053  
Actual return on plan assets 1,685 (629)  
Employer contributions 170 0  
Benefits/expenses paid (594) (414)  
Fair value of plan assets at end of year 11,271 10,010 $ 11,053
Funded Status:      
Net amount recognized as accrued pension cost $ 3,876 $ 2,124