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DEBT (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Schedule of composition of the Company's debt and financing obligations
The composition of the 2022 Notes is as follows (in thousands):
 
June 30,
 
December 31,
 
2017
 
2016
2.375% convertible senior notes due 2022
$
345,000

 
$
—

Deferred financing costs
(8,272
)
 
—

Discount on debt
(67,400
)
 
—

     Total debt, net of debt discount and deferred financing costs
$
269,328

 
$
—
Schedule of total interest expense recognized related to the Notes
The following table sets forth the total interest expense recognized in the periods presented (in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Contractual interest expense
$
2,053

 
$
963

 
$
3,242

 
$
1,926

Amortization of debt issuance costs
389

 
153

 
590

 
306

Amortization of debt discount
2,951

 
1,022

 
4,362

 
2,044

Capitalized interest (Note 4)
(167
)
 
(405
)
 
(379
)
 
(675
)
        Total
$
5,226

 
$
1,733

 
$
7,815

 
$
3,601

 
 
 
 
 
 
 
 
Effective interest rate on convertible senior notes
7.81
%
 
7.22
%
 
7.70
%
 
7.22
%