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Retirement Plans - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Contributions to defined benefit plan $ 165    
Pension plan      
Defined Benefit Plan Disclosure [Line Items]      
Service period 5 years    
Assumptions used in determining periodic pension cost:      
Discount rate 4.20%    
Expected long-term rate of return on plan assets 7.30% 7.50%  
Pension plan | Equities      
Current investment policy targets:      
Current investment mix 65.00%   64.00%
Pension plan | Treasury/Corporate Notes      
Current investment policy targets:      
Current investment mix 34.00%   35.00%
Pension plan | Money market funds      
Current investment policy targets:      
Current investment mix 1.00%   1.00%