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Employee Benefit Plans (Details 3) (Pension Plans, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee benefit plans      
Accumulated benefit obligation for funded defined benefit pension plan $ 116,800,000 $ 124,500,000 $ 102,400,000
Accumulated benefit obligation for unfunded defined benefit pension plan 5,000,000 5,100,000 4,900,000
Certain information related to pension plans      
Projected benefit obligation 121,767,000 129,802,000 131,927,000
Accumulated benefit obligation 121,767,000 129,599,000  
Fair value of plan assets $ 130,491,000 $ 115,489,000 $ 105,159,000
Target allocation of any one stock, maximum (as a percent) 10.00%    
Maximum average maturity of bond portfolio 10 years    
Target Allocation      
Total (as a percent) 100.00% 100.00%  
Debt securities
     
Target Allocation      
Target Allocation of securities, minimum (as a percent) 20.00%    
Target Allocation of securities, maximum (as a percent) 50.00%    
Total (as a percent) 20.00% 25.00%  
Equity securities
     
Target Allocation      
Target Allocation of securities, minimum (as a percent) 30.00%    
Target Allocation of securities, maximum (as a percent) 60.00%    
Total (as a percent) 66.00% 57.00%  
Other
     
Target Allocation      
Target Allocation of securities, minimum (as a percent) 5.00%    
Target Allocation of securities, maximum (as a percent) 50.00%    
Total (as a percent) 14.00% 18.00%