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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
Allowance for Doubtful Accounts [Table Text Block]

The following table sets forth the activity in the allowance for doubtful accounts for the years ended December 31, 2017, 2016 and 2015 (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Allowance for doubtful accounts – beginning of year
$
757

 
$
643

 
$
1,182

Bad debt (recovery) expense
(340
)
 
886

 
(23
)
Increase (reduction) in allowance for doubtful accounts
809

 
(772
)
 
(516
)
Allowance for doubtful accounts – end of year
$
1,226

 
$
757

 
$
643