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Retirement Plans - Additional Information (Details) (Pension plan, USD $)
In Thousands, unless otherwise specified
3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Equities
Dec. 31, 2013
Equities
Mar. 31, 2014
Treasury/Corporate Notes
Dec. 31, 2013
Treasury/Corporate Notes
Mar. 31, 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%  
Equity and debt investment fluctuations by plus or minus 20.00%              
Current investment policy target, maximum     78.00%          
Current investment policy target, minimum     52.00%          
Current investment mix     60.00% 54.00% 34.00% 30.00% 6.00% 16.00%
Assumptions used in determining periodic pension cost:                
Rate of increase in periodic pension costs   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