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Benefit Plans - Contributions to Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jul. 01, 2019
Dec. 31, 2018
Qualified Plan (ERP)      
Benefit plans      
Benefit accruals for the company's employees $ 0    
Pension Benefits      
Benefit plans      
Benefit accruals for the company's employees (100,626)   $ (99,491)
Pension Benefits | Qualified Plan (ERP)      
Benefit plans      
Expected contributions in 2020 0    
Pension Benefits | Nonqualified Plan      
Benefit plans      
Expected contributions in 2020 200    
SERP and Directors' Plan      
Benefit plans      
Benefit accruals for the company's employees   $ 0  
Expected contributions in 2020 0    
Other Benefits | Nonqualified Plan      
Benefit plans      
Expected contributions in 2020 $ 1,200