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Employee benefit plans (Tables)
9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost

 

 

 

 

 

 

 

 

 

 

Postretirement Life

 

 

 

Insurance Benefits

 

 

 

Pension Benefits

 

Three Months Ended September 30, 

    

2015

    

2014

    

Components of net periodic pension cost:

    

 

 

    

 

 

 

Service cost

 

$

174

 

$

169

 

Interest cost

 

 

(233)

 

 

(227)

 

Amortization of unrecognized net gain

 

 

50

 

 

23

 

Net periodic other benefit cost

 

$

(9)

 

$

(35)

 

 

 

 

 

 

 

 

 

 

 

Pension Benefits

 

Nine Months Ended September 30, 

    

2015

    

2014

    

Components of net periodic pension cost:

    

 

 

    

 

 

 

Service cost

 

$

522

 

$

507

 

Interest cost

 

 

(699)

 

 

(681)

 

Amortization of unrecognized net gain

 

 

150

 

 

69

 

Net periodic other benefit cost

 

$

(27)

 

$

(105)