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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Changes in Allowance for Doubtful Accounts

The following are the changes in the allowance for doubtful accounts:

 

     Year Ended December 31,  
     2017      2016      2015  
     (In Thousands)  

Balance at beginning of year

    $ 150      $ 150      $ 150  

Provisions for doubtful accounts

      30        104        67  

Charge-offs, net of recoveries

      (30 )       (104 )       (67 ) 
  

 

 

     

 

 

     

 

 

  

Balance at end of year

    $ 150      $ 150      $ 150