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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined benefit pension plan        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 2,259 $ 2,270 $ 4,517 $ 4,541
Expected return on plan assets (2,724) (3,080) (5,447) (6,161)
Pension settlement (429) (1,371) (429) (1,371)
Net benefit credit (894) (2,181) (1,359) (2,991)
Other postretirement benefits plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 120 139 240 279
Interest cost 877 919 1,753 1,837
Net benefit credit $ 997 $ 1,058 $ 1,993 $ 2,116