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Employee Retirement Plans - Expected Benefit Payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Expected benefit payments    
Voluntary contribution $ 7,000  
Pension plan    
Expected benefit payments    
2019 1,540  
2020 1,530  
2021 1,560  
2022 1,740  
2023 1,820  
2024-2028 10,920  
Pension funding contributions made 7,047 $ 1,669
Required pension funding contributions expected to be made in next fiscal year 0  
Pension plan | Minimum    
Expected benefit payments    
Pension funding contributions made $ 47