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Employee Benefit Plans - Narrative (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2019
shares
Dec. 31, 2019
USD ($)
plan
employee
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Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
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Dec. 31, 2016
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May 31, 2014
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cost recognized | $   $ 1,603,000 $ 1,488,000 $ 1,299,000    
Number of retired union participants still receiving benefits   166        
Number of retired union participants eligible for benefits | employee   23        
Age of eligibility to receive benefits   62 years        
Minimum years of service to obtain eligibility for benefits   5 years        
Non-union retirees still receiving benefits, age of coverage   65 years        
Common Stock, authorized (in shares)   40,000,000 40,000,000      
Treasury Stock (in shares)   1,087,840 1,259,551      
Number of active plans | plan   2        
Share-based compensation expense | $   $ 2,424,000 $ 2,612,000 $ 2,245,000    
Grants in period (in shares)   83,683        
Stock shares repurchased (in shares)   77,481 27,214 74,132    
Stock shares repurchased | $   $ 5,489,000 $ 2,324,000 $ 4,663,000    
EDC plan investments | $   1,185,000 0      
EDC plan liabilities | $   $ 1,337,000 $ 1,176,000      
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSUs vested in period (in shares)   235,409 80,343 203,000    
Grants in period (in shares)   45,993 42,136 47,514    
Number of nonvested shares (in shares)   116,855 329,205 368,492 527,486  
Options, vested in period, fair value | $   $ 2,951,000 $ 1,239,000 $ 979,000    
Unrecognized compensation costs, other than options | $   $ 2,745,000        
Period for recognition of unrecognized compensation cost   2 years 2 months 12 days        
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock authorized but not granted (in shares)           300,000
Short-term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Targeted bonus award expense | $   $ 461,000 5,581,000 5,150,000    
Short-term Incentive Plan | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense | $   $ 123,000 821,000 $ 491,000    
Award vesting period   48 months        
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Award vesting period, tranche one            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period   12 months        
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Remaining award vesting period            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period   36 months        
The 2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock authorized but not granted (in shares)   1,500,000        
The 2014 Plan | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period   3 years        
Grants in period (in shares)   344,190        
The Director's Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock authorized but not granted (in shares)   300,000        
The 2004 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period   5 years        
RSUs vested in period (in shares) 145,000          
Restricted stock authorized but not granted (in shares)   2,680,000        
Weighted average remaining contractual term   10 years        
The 2004 Plan | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant (in shares)   0        
Authorized shares remaining for issuance (in shares)   0        
The 2004 Plan | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options outstanding (in shares)   0        
The 2004 Plan | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of nonvested shares (in shares)   0        
Number of shares available for grant (in shares)   0        
Post-employment benefits            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Liability, defined benefit plan, current | $   $ 441,000 467,000      
Liability, defined benefit plan, noncurrent | $   $ 2,509,000 $ 2,595,000