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LONG TERM DEBT AND CREDIT AGREEMENT Net Carrying Value of Debt (Tables)
 3 Months Ended
Mar. 31, 2016
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
The net carrying amount of the liability component of the Notes consists of the following at March 31, 2016 (in thousands):
 
March 31, 2016
Principal amount of notes
$
125,000

Original debt discount due to:
 
     Allocation of proceeds to equity
(28,298
)
     Allocation of issuance costs to debt
(3,641
)
     Accumulated accretion of discount to interest expense
4,248

Net carrying value
$
97,309