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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Compensation and Retirement Disclosure [Abstract]          
Settlement loss $ 0   $ 231,000 $ 46,000 $ 231,000
Number of days used to compute performance period average closing price of restricted stock units       20 days  
Pension Benefits          
Compensation and Retirement Disclosure [Abstract]          
Special termination benefits related to VSL programs 0   (35,000) $ 0 (35,000)
Settlement loss 0   71,000 0 71,000
Other Postretirement Benefits          
Compensation and Retirement Disclosure [Abstract]          
Special termination benefits related to VSL programs 0   (125,000) (46,000) (125,000)
Settlement loss $ 0   $ 0 0 $ 0
Employee Separation | Voluntary Separation Leave Programs          
Compensation and Retirement Disclosure [Abstract]          
Special termination benefits related to VSL programs   $ 46,000   $ 46,000  
Employee Separation | Voluntary Separation Leave Programs | Part-Time Employees          
Compensation and Retirement Disclosure [Abstract]          
One-time per employee contribution for special termination benefits related to VSL programs   75      
Employee Separation | Voluntary Separation Leave Programs | Full-Time Employees          
Compensation and Retirement Disclosure [Abstract]          
One-time per employee contribution for special termination benefits related to VSL programs   $ 125      
RSUs          
Compensation and Retirement Disclosure [Abstract]          
Awards granted (in shares)       2.9  
Vesting percentage       25.00%  
Vesting period       6 months  
Term of award       two-year  
Time-Vested RSUs          
Compensation and Retirement Disclosure [Abstract]          
Awards granted (in shares)       1.3  
Performance-Based RSUs          
Compensation and Retirement Disclosure [Abstract]          
Awards granted (in shares)       1.6