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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