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Retirement Plans - Additional Information (Details) (Pension plan, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Mar. 31, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Equities
Dec. 31, 2013
Equities
Jun. 30, 2014
Treasury/Corporate Notes
Dec. 31, 2013
Treasury/Corporate Notes
Jun. 30, 2014
Money market funds
Dec. 31, 2013
Money market funds
Defined Benefit Plan Disclosure [Line Items]                  
Estimated contribution to the pension plan in 2013   $ 600              
Current investment policy targets:                  
Current investment policy target       65.00%   25.00%   10.00%  
Current investment policy target, maximum       78.00%          
Current investment policy target, minimum       52.00%          
Current investment mix       61.00% 54.00% 35.00% 30.00% 4.00% 16.00%
Assumptions used in determining periodic pension cost:                  
Rate of increase in periodic pension costs   5.00% 5.00%            
Weighted-average discount rate   5.00% 5.00%            
Expected long-term rate of return on plan assets   7.50% 7.50%            
Increase in pension liability due to annuity settlement 392                
Increase in expense due to annuity settlement $ (407)