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Reclassifications Out of Accumulated Other Comprehensive Loss - Reclassifications of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax (expense) benefit $ 50,500 $ 14,915
Net income 145,596 100,328
Interest expense 105,449 $ 196,575
Reclassifications, net of tax [1] (5,493)  
Past service liability    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1],[2] 62  
Actuarial losses    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1],[2] (1,743)  
Amortization of defined benefit pension    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1] (1,681)  
Tax benefit [1] 462  
Reclassifications, net of tax [1] (1,219)  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains (losses) on available-for-sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain (losses) on securities [1]  
Income tax (expense) benefit [1]  
Net income [1]  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized loss on cash flow hedges    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax (expense) benefit [1] 1,617  
Net income [1] (4,274)  
Interest expense [1] $ (5,891)  
[1] Amounts in parentheses indicate expense items.
[2] See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.