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Schedule II - Valuation and Qualifying Accounts (Tables)
12 Months Ended
Dec. 31, 2019
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, 2019
                               
                                 
Deducted from asset accounts:
                               
Allowance for doubtful accounts
  $
533
     
83
     
178
    $
438
 
                                 
Year Ended December 31, 2018
                               
                                 
Deducted from asset accounts:
                               
Allowance for doubtful accounts
  $
342
     
196
     
5
    $
533