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Reclassifications Out of Accumulated Other Comprehensive Loss - Reclassifications of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax (expense) benefit $ 76,695 $ 128,264 $ 135,252
Net income 511,109 395,043 422,417
Interest expense 607,851 $ 847,760 $ 658,678
Reclassifications, net of tax [1] (13,186)    
Past service liability      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1],[2] 249    
Actuarial losses      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1],[2] (7,352)    
Amortization of defined benefit pension      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1] (7,103)    
Tax benefit [1] 1,953    
Reclassifications, net of tax [1] (5,150)    
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available-for-sale securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net gain on securities [1] 683    
Income tax (expense) benefit [1] (188)    
Net income [1] 495    
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on cash flow hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax (expense) benefit [1] 3,236    
Net income [1] (8,531)    
Interest expense [1] $ (11,767)    
[1] Amounts in parentheses indicate expense items.
[2] See Note 14, “Employee Benefits,” for additional information.