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LONG TERM DEBT AND CREDIT AGREEMENT Net Carrying Value of Debt (Tables)
 6 Months Ended
Jun. 30, 2015
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:

 
June 30, 2015
 
(in thousands)
Principal amount of notes
$
125,000

Original debt discount due to:
 
     Allocation of proceeds to equity
(28,298
)
     Allocation of issuance costs to debt
(3,412
)
     Accumulated accretion
207

Net carrying value
$
93,497