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Employee Benefit Plans (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Determination of pension expense for year ended:          
Pension expense $ 1,173,000 $ 1,224,000 $ 907,000    
Pension
          
Defined Benefit Plan Disclosure          
Estimated prior service cost for the defined benefit pension plan that will be amortized from accumulated other comprehensive income into net periodic cost in 2014 79,000        
Estimated amount of actuarial loss subject to amortization into net periodic pension cost 30,000        
Determination of benefit obligation at year end:          
Discount rate (as a percent) 5.00% 4.25% 4.75%    
Annual rate of compensation increase (as a percent) 3.73% 3.61% 4.50%    
Determination of pension expense for year ended:          
Discount rate for the service cost (as a percent) 5.00% 4.75% 5.75%    
Annual rate of compensation increase (as a percent) 3.73% 3.61% 4.50%    
Expected long-term rate of return on plan assets (as a percent) 7.00% 7.00% 7.00%    
Annual return on plan assets (as a percent) 19.10% 11.40% 0.10% 12.40% 22.00%
Pension expense 1,200,000        
Pension | Estimated
          
Determination of pension expense for year ended:          
Pension expense $ 945,000