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ACCOUNTS RECEIVABLE (Tables)
6 Months Ended
Jun. 30, 2016
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts receivable consisted of the following (amounts in thousands):
 
June 30,
2016
 
December 31,
2015
Accounts receivable
$
201,014

 
$
181,916

Allowance for doubtful accounts
(4,296
)
 
(4,527
)
Accounts receivable, net
$
196,718

 
$
177,389