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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DB Pension Plans      
Components of net periodic benefit cost      
Service cost $ 0 $ 0 $ 0
Interest cost 2,508 2,501 2,473
Expected return on plan assets (5,648) (5,088) (4,844)
Amortization of prior service (credit) cost (10) (10) (15)
Recognized net actuarial loss 1,118 1,075 975
Net periodic benefit (credit) cost (2,032) (1,522) (1,411)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) 7,761 1,434 1,880
Recognized actuarial loss (1,118) (1,075) (975)
Prior service credit 0 0 0
Recognized prior service cost (credit) 10 10 15
Recognized in other comprehensive income (loss) 6,653 369 920
Total recognized in net periodic benefit cost and other comprehensive income 4,621 (1,153) (491)
Life and Healthcare Plan      
Components of net periodic benefit cost      
Service cost 212 192 258
Interest cost 270 268 283
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost (62) (62) 16
Recognized net actuarial loss 62 34 5
Net periodic benefit (credit) cost 482 432 562
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) (1,337) 708 210
Recognized actuarial loss (62) (34) (5)
Prior service credit 0 (964) 0
Recognized prior service cost (credit) 62 62 (16)
Recognized in other comprehensive income (loss) (1,337) (228) 189
Total recognized in net periodic benefit cost and other comprehensive income (855) 204 751
SERP Plan      
Components of net periodic benefit cost      
Service cost 160 166 171
Interest cost 833 852 832
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost 87 87 75
Recognized net actuarial loss 539 399 358
Net periodic benefit (credit) cost 1,619 1,504 1,436
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) (2,987) 2,407 697
Recognized actuarial loss (539) (399) (358)
Prior service credit 0 0 188
Recognized prior service cost (credit) (87) (87) (75)
Recognized in other comprehensive income (loss) (3,613) 1,921 452
Total recognized in net periodic benefit cost and other comprehensive income $ (1,994) $ 3,425 $ 1,888