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9. Employee Benefits (Tables)
9 Months Ended
Sep. 30, 2017
Employee Benefits  
Net periodic cost (benefit)
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2017     2016     2017     2016  
    (In thousands)     (In thousands)  
             
Components of net periodic cost (benefit)                                
Service cost   $     $     $     $  
Interest cost     214       221       642       663  
Expected return on assets     (287 )     (300 )     (861 )     (900 )
Amortization of transition (asset)/obligation                        
Amortization of net (gain) / loss     101       138       303       414  
   Net periodic cost (benefit)   $ 28     $ 59     $ 84     $ 177