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Pension and Other Postretirement Benefits - Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss (gain) $ 71,087 $ 20,426 $ 43,027
Amortization of prior service cost (1,271) (1,335) (1,335)
Amortization of net actuarial loss (23,376) (33,617) (25,445)
Prior service cost 1,878 0 0
Regulatory adjustment (36,944) 8,233 (12,340)
Recognized in other comprehensive (income) loss 11,374 (6,293) 3,907
Net periodic benefit costs recognized in net income 42,465 51,332 44,593
Total of amount recognized in net periodic benefit cost and other comprehensive (income) loss 53,839 45,039 48,500
Qualified Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss (gain) 66,557 23,607 44,149
Amortization of prior service cost 0 0 0
Amortization of net actuarial loss (22,356) (32,115) (24,004)
Prior service cost 0 0 0
Regulatory adjustment (39,782) 7,657 (18,131)
Recognized in other comprehensive (income) loss 4,419 (851) 2,014
Net periodic benefit costs recognized in net income 36,982 46,089 38,283
Total of amount recognized in net periodic benefit cost and other comprehensive (income) loss 41,401 45,238 40,297
SERP      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss (gain) 7,975 (3,940) 3,334
Amortization of prior service cost 0 0 0
Amortization of net actuarial loss (1,020) (1,502) (1,441)
Prior service cost 0 0 0
Regulatory adjustment 0 0 0
Recognized in other comprehensive (income) loss 6,955 (5,442) 1,893
Net periodic benefit costs recognized in net income 3,046 3,405 3,633
Total of amount recognized in net periodic benefit cost and other comprehensive (income) loss 10,001 (2,037) 5,526
PBOP      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss (gain) (3,445) 759 (4,456)
Amortization of prior service cost (1,271) (1,335) (1,335)
Amortization of net actuarial loss 0 0 0
Prior service cost 1,878 0 0
Regulatory adjustment 2,838 576 5,791
Recognized in other comprehensive (income) loss 0 0 0
Net periodic benefit costs recognized in net income 2,437 1,838 2,677
Total of amount recognized in net periodic benefit cost and other comprehensive (income) loss $ 2,437 $ 1,838 $ 2,677