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Employee Benefit Plan - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Plan        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 723 663 1,468 1,254
Expected return on plan assets (1,232) (1,406) (2,466) (2,824)
Amortization of net retirement plan actuarial loss 330 292 667 559
Amortization of net retirement plan prior service (credit) cost (3) (3) (5) (5)
Net periodic benefit (income) cost (182) (454) (336) (1,016)
Life and Health        
Components of net periodic benefit cost        
Service cost 30 53 80 106
Interest cost 72 71 145 135
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 0 16 0 31
Amortization of net retirement plan prior service (credit) cost (15) (15) (31) (31)
Net periodic benefit (income) cost 87 125 194 241
SERP Benefits        
Components of net periodic benefit cost        
Service cost 39 35 77 80
Interest cost 228 211 456 417
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 70 135 154 270
Amortization of net retirement plan prior service (credit) cost 22 22 44 44
Net periodic benefit (income) cost $ 359 $ 403 $ 731 $ 811