Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans - Expected Benefit Payments (Details)

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Employee Retirement Plans - Expected Benefit Payments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Expected benefit payments      
Voluntary contribution     $ 7,000
Conjunction with the termination $ 464    
Pension plan      
Expected benefit payments      
Pension funding contributions made   $ 460  
Pension plan | Minimum      
Expected benefit payments      
Pension funding contributions made   $ 0