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Benefit Plans - Change in Accumulated Other Comprehensive Income (AOCI) and Expected Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension and Supplemental Executive Retirement Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
AOCI in Prior Year $ 98,589 $ 108,808
Recognized during year - Prior Service (Cost)/Credit 247 281
Recognized during year - Net Actuarial (Losses)/Gains (16,948) (8,412)
Occurring during year - Prior Service Cost 2 (5)
Occurring during year - Net Actuarial Losses/(Gains) 16,021 (150)
Occuring during year - Net Settlement Losses/(Gains) 0 (1,933)
AOCI in Current Year 97,911 98,589
Other Postretirement Benefit Plan    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
AOCI in Prior Year (15,281) 3,629
Recognized during year - Prior Service (Cost)/Credit (51) 34
Recognized during year - Net Actuarial (Losses)/Gains 782 0
Occurring during year - Prior Service Cost 0 0
Occurring during year - Net Actuarial Losses/(Gains) (13,342) (18,944)
Occuring during year - Net Settlement Losses/(Gains) 0 0
AOCI in Current Year $ (27,892) $ (15,281)