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Pension and Other Post-Retirement Benefits And Employee Benefits - Pension and Post-Retirement Plans (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
 [1]
Mar. 31, 2020
 [1]
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits          
Components of net periodic pension expense (credit):          
Interest cost $ 912,000 $ 1,173,000 $ 4,692,000 $ 5,660,000 $ 5,085,000
Amortization of prior-service liability     0    
Expected return on plan assets (4,016,000) (3,876,000) (15,505,000) (13,933,000) (16,139,000)
Amortization of net actuarial loss 1,732,000 1,831,000 7,327,000 10,035,000 7,179,000
Net periodic pension (credit) expense (1,372,000) (872,000) (3,486,000) 1,762,000 (3,875,000)
Post-Retirement Benefits          
Components of net periodic pension expense (credit):          
Interest cost 56,000 82,000 327,000 512,000 513,000
Amortization of prior-service liability (62,000) (62,000) (249,000) (249,000) (249,000)
Amortization of net actuarial loss 11,000 6,000 25,000 124,000 309,000
Net periodic pension (credit) expense $ 5,000 $ 26,000 $ 103,000 $ 387,000 $ 573,000
[1] Amounts are included in G&A expense on the Consolidated Statements of Income and Comprehensive Income.