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Pension Benefits (Tables)
3 Months Ended
Mar. 31, 2015
Pension Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
Three months ended
March 31,
2015 2014  
Components of net periodic benefit cost        
Service cost   $ 400     $ 430  
Interest cost     325       331  
Expected return on plan assets     (525 )     (498 )
Amortization of prior year service cost     -       (5 )
Recognized net actuarial loss     300       272  
Net periodic pension cost   $ 500     $ 530