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Retirement Plans - Additional Information (Details) - Pension plan - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Estimated contribution to the pension plan $ 450    
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 4.60% 4.60%  
Expected long-term rate of return on plan assets 7.50% 7.50%  
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 59.00%   61.00%
Treasury/Corporate Notes      
Current investment policy targets:      
Current investment policy target 25.00%    
Current investment mix 35.00%   33.00%
Money market funds      
Current investment policy targets:      
Current investment policy target 10.00%    
Current investment mix 6.00%   6.00%