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9. Employee Benefits (Tables)
9 Months Ended
Sep. 30, 2016
Employee Benefits  
Net periodic cost (benefit)
   Three Months Ended   Nine Months Ended 
   September 30,   September 30, 
   2016   2015   2016   2015 
   (In thousands)   (In thousands) 
Components of net periodic cost (benefit)                
Service cost  $   $   $   $ 
Interest cost   221    211    663    633 
Expected return on assets   (300)   (377)   (900)   (1,131)
Amortization of transition (asset)/obligation                
Amortization of net (gain) / loss   138    87    414    261 
   Net periodic cost (benefit)  $59   $(79)  $177   $(237)