XML 61 R35.htm IDEA: XBRL DOCUMENT v3.19.1
Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Valuation and Qualifying Accounts Disclosure [Table Text Block]
   
Balance at Beginning
of Period
    
(Recovered From)/
Charged to Costs and Expenses
    
Deductions
(1)
    
Balance at End
of Period
  
Year ended December 31, 2018:
                                
                                 
Deducted from asset accounts:
                                
Allowance for doubtful accounts
   $
342
      
196
      
5
     $
533
  
                                 
Year ended December 31, 2017:
                                
                                 
Deducted from asset accounts:
                                
Allowance for doubtful accounts
   $
288
      
113
      
59
     $
342