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Employee Benefit Plans - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
employees
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of employees offered one-time distribution | employees 4,500    
Number of employees who accepted one-time distribution | employees 1,700    
Proportion of employees who accepted one-time distribution (as a percent) 38.00%    
One-time distribution expense $ 80,000    
One-time distribution settlement $ 90,000    
Proportion of pension plan obligations settled (as a percent) 4.00%    
Pension lump sum settlement expense related to unrecognized actuarial losses $ 32,000    
Accrued pension liability 417,692 $ 460,733  
Pension related adjustments 0 0 $ (5,454)
Expense related to defined contribution savings plans 39,000 40,000 39,000
Deferred compensation 71,442 59,803  
Non-qualified supplemental pension plan      
Defined Benefit Plan Disclosure [Line Items]      
Accrued pension liability 58,000 53,000  
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement expense 93,049 0  
Reduction to projected benefit obligation 102,905 0  
Net actuarial loss to be recognized 32,000    
Required pension contributions to our pension plans 37,000    
Benefit obligation 2,324,080 2,135,143 $ 2,298,902
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation 22,000 19,000  
Rabbi Trusts | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Assets held in trust 72,000 60,000  
Value of common stock issued in trust $ 1,000 $ 1,000  
United States      
Defined Benefit Plan Disclosure [Line Items]      
U.S. pension plan assets percentage of total pension plan assets 72.00%