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9. Employee Benefits (Tables)
6 Months Ended
Jun. 30, 2016
Employee Benefits  
Net periodic cost (benefit)
   Three Months Ended   Six Months Ended 
   June 30,   June 30, 
   2016   2015   2016   2015 
   (In thousands)   (In thousands) 
Components of net periodic cost (benefit)                
Service cost  $   $   $   $ 
Interest cost  221    211    442    422 
Expected return on assets  (300)   (377)   (600)   (754)
Amortization of transition (asset)/obligation               
Amortization of net (gain) / loss  138    87    276    174 
   Net periodic cost (benefit)  $59   $(79)  $118   $(158)