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Retirement Plans - Additional Information (Details) - Pension plan - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]        
Estimated contribution to the pension plan   $ 600,000    
Current investment policy targets:        
Defined Benefit Plan Assets, Target Allocation Period Increase (Decrease) Percentage   20.00%    
Assumptions used in determining periodic pension cost:        
Discount rate   4.30% 4.30%  
Expected long-term rate of return on plan assets   7.50% 7.50%  
Increase in pension liability due to annuity settlement $ 392,000      
Increase in expense due to annuity settlement $ 407,000      
Equities        
Current investment policy targets:        
Current investment policy target   65.00%    
Current investment policy target, maximum   78.00%    
Current investment policy target, minimum   52.00%    
Current investment mix   63.00%   59.00%
Treasury/Corporate Notes        
Current investment policy targets:        
Current investment policy target   25.00%    
Current investment mix   31.00%   30.00%
Money market funds        
Current investment policy targets:        
Current investment policy target   10.00%    
Current investment mix   6.00%   11.00%