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FINANCING ARRANGEMENTS Schedule of Convertible Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Notes
The carrying amount of the Notes consisted of the following as of March 31, 2018 and December 31, 2017 (in thousands):
 
March 31, 2018
 
December 31, 2017
Liability component:
 
 
 
Principal amount
$
250,000

 
$
250,000

Less: debt discount
(57,381
)
 
(60,247
)
Net carrying amount of liability component
$
192,619

 
$
189,753

 
 
 
 
Net carrying amount of equity component
$
67,014

 
$
67,014
Schedule of Convertible Debt Interest Expense
During the three months ended March 31, 2018 and 2017, the Company recognized interest expense on the Notes as follows (in thousands):
 
Three Months Ended March 31,
 
2018
 
2017
Contractual interest expense (3.25% of the principal amount per annum)
$
2,032

 
$
2,032

Amortization of debt discount
2,866

 
2,587

Total interest expense
$
4,898

 
$
4,619