Employee Benefit Plans - Pre-Tax Amounts Recognized as Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
---|---|---|---|
DB Pension Plan | |||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |||
Net actuarial loss (gain) | $ 50,533 | $ 48,045 | $ 46,603 |
Prior service cost (credit) | 1 | (9) | (20) |
Total | 50,534 | 48,036 | 46,583 |
Life and Healthcare Plan | |||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |||
Net actuarial loss (gain) | 2,771 | 1,586 | 368 |
Prior service cost (credit) | (287) | (348) | (606) |
Total | 2,484 | 1,238 | (238) |
SERP Plan | |||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |||
Net actuarial loss (gain) | 14,614 | 11,345 | 5,560 |
Prior service cost (credit) | 2,148 | 2,433 | 514 |
Total | $ 16,762 | $ 13,778 | $ 6,074 |