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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 956 $ 1,084
Interest cost 4,840 4,642
Expected return on plan assets (5,444) (5,674)
Amortization of prior service cost (credit) 16 8
Recognized actuarial (gain) loss 1,833 2,397
Settlement loss 0 42
Net periodic benefit cost 2,201 2,499
Postretirement benefit plans    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 50 52
Amortization of prior service cost (credit) (509) (509)
Recognized actuarial (gain) loss (96) (80)
Net periodic benefit cost $ (555) $ (537)