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DEBT (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of composition of the Company's debt and financing obligations
The total debt composition of the 2022 Notes is as follows (in thousands):
 
June 30,
 
December 31,
 
2018
 
2017
2.375% convertible senior notes due 2022
$
345,000

 
$
345,000

Deferred financing costs
(6,675
)
 
(7,482
)
Discount on debt
(55,067
)
 
(61,345
)
     Total debt, net of debt discount and deferred financing costs
$
283,258

 
$
276,173
Schedule of total interest expense recognized related to the Notes
The following table sets forth the total interest expense recognized in the periods presented (dollar amounts in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
Contractual interest expense
$
2,051

 
$
2,053

 
$
4,102

 
$
3,242

Amortization of debt issuance costs
406

 
389

 
808

 
590

Amortization of debt discount
3,170

 
2,951

 
6,283

 
4,362

Capitalized interest and other (Note 5)
(230
)
 
(167
)
 
(640
)
 
(379
)
        Total
$
5,397

 
$
5,226

 
$
10,553

 
$
7,815

 
 
 
 
 
 
 
 
Effective interest rate on convertible senior notes
7.81
%
 
7.81
%
 
7.81
%
 
7.70
%