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9. Employee Benefits (Tables)
6 Months Ended
Jun. 30, 2017
Employee Benefits  
Net periodic cost (benefit)
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2017     2016     2017     2016  
    (In thousands)     (In thousands)  
Components of net periodic cost (benefit)                                
Service cost   $     $     $     $  
Interest cost     214       221       428       442  
Expected return on assets     (287 )     (300 )     (574 )     (600 )
Amortization of transition (asset)/obligation                        
Amortization of net (gain) / loss     101       138       202       276  
   Net periodic cost (benefit)   $ 28     $ 59     $ 56     $ 118