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CONVERTIBLE DEBT (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Debt [Table Text Block]
A summary of the gross carrying amount, unamortized debt cost, debt issuance costs and net carrying value of the liability component of the Notes are as follows (in thousands):
 
December 31,
2017
 
December 31,
2016
Gross carrying amount
$
300,000

 
$
—

Unamortized debt discount
55,202

 
—

Debt issuance costs
6,599

 
—

Net carrying amount
$
238,199

 
$
—