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Employee Benefit Plan - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DB Pension Plan      
Components of net periodic benefit cost      
Service cost $ 0 $ 0 $ 1,587
Interest cost 2,501 2,473 2,987
Expected return on plan assets (5,088) (4,844) (5,028)
Amortization of prior service (credit) cost (10) (15) (448)
Recognized net actuarial loss 1,075 975 1,573
Recognized net actuarial gain due to curtailments 0 0 (6,003)
Net periodic benefit (credit) cost (1,522) (1,411) (5,332)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) 1,434 1,880 (169)
Recognized actuarial loss (1,075) (975) (1,573)
Prior service (credit) cost 0 0 0
Recognized prior service cost (credit) 10 15 6,451
Recognized in other comprehensive income (loss) 369 920 4,709
Total recognized in net periodic benefit cost and other comprehensive income (loss) (1,153) (491) (623)
Life and Healthcare Plan      
Components of net periodic benefit cost      
Service cost 192 258 236
Interest cost 268 283 323
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost (62) 16 16
Recognized net actuarial loss 34 5 19
Recognized net actuarial gain due to curtailments 0 0 0
Net periodic benefit (credit) cost 432 562 594
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) 708 210 (467)
Recognized actuarial loss (34) (5) (19)
Prior service (credit) cost (964) 0 0
Recognized prior service cost (credit) 62 (16) (16)
Recognized in other comprehensive income (loss) (228) 189 (502)
Total recognized in net periodic benefit cost and other comprehensive income (loss) 204 751 92
SERPs      
Components of net periodic benefit cost      
Service cost 166 171 201
Interest cost 852 832 928
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost 87 75 73
Recognized net actuarial loss 399 358 626
Recognized net actuarial gain due to curtailments 0 0 0
Net periodic benefit (credit) cost 1,504 1,436 1,828
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) 2,407 697 (1,210)
Recognized actuarial loss (399) (358) (626)
Prior service (credit) cost 0 188 0
Recognized prior service cost (credit) (87) (75) (73)
Recognized in other comprehensive income (loss) 1,921 452 (1,909)
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 3,425 $ 1,888 $ (81)