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Pension Plans - Fair Value of Pension and Estimated future benefit (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension plans      
Fair values of pension assets $ 11,440,000 $ 10,299,000 $ 8,166,000
Minimum required pension contributions for 2019 0    
Estimated future benefit payments      
2019 1,637,000    
2020 557,000    
2021 563,000    
2022 568,000    
2023 627,000    
2024-2028 $ 3,339,000    
Equity Funds      
Pension plans      
Target allocations for plan assets (as a percent) 25.00% 60.00%  
Passively Managed Exchange Traded Funds      
Pension plans      
Target allocations for plan assets (as a percent)   50.00%  
Actively Managed Exchange Traded Funds      
Pension plans      
Target allocations for plan assets (as a percent)   50.00%  
Total mutual funds/ETFs | Total      
Pension plans      
Fair values of pension assets $ 11,440,000 $ 10,299,000  
Total mutual funds/ETFs | Level 1      
Pension plans      
Fair values of pension assets 11,440,000 10,299,000  
Equity-large cap | Total      
Pension plans      
Fair values of pension assets 770,000 2,623,000  
Equity-large cap | Level 1      
Pension plans      
Fair values of pension assets 770,000 2,623,000  
Equity-mid cap | Total      
Pension plans      
Fair values of pension assets 374,000 1,022,000  
Equity-mid cap | Level 1      
Pension plans      
Fair values of pension assets 374,000 1,022,000  
Equity-small cap | Total      
Pension plans      
Fair values of pension assets 453,000 1,200,000  
Equity-small cap | Level 1      
Pension plans      
Fair values of pension assets 453,000 1,200,000  
Equity-international | Total      
Pension plans      
Fair values of pension assets 560,000 1,651,000  
Equity-international | Level 1      
Pension plans      
Fair values of pension assets 560,000 $ 1,651,000  
Fixed income      
Pension plans      
Target allocations for plan assets (as a percent)   40.00%  
Fixed income | Total      
Pension plans      
Fair values of pension assets 8,798,000 $ 2,520,000  
Fixed income | Level 1      
Pension plans      
Fair values of pension assets 8,798,000 2,520,000  
Money market | Total      
Pension plans      
Fair values of pension assets 485,000 1,283,000  
Money market | Level 1      
Pension plans      
Fair values of pension assets $ 485,000 $ 1,283,000  
Liability hedges      
Pension plans      
Target allocations for plan assets (as a percent) 75.00%