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DEBT (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of composition of the Company's debt and financing obligations
The total debt composition of the 2019 Notes is as follows (in thousands):
 
December 31,
 
2017
 
2016
3.25% convertible senior notes due 2019
$
338

 
$
118,531

Deferred financing costs
(2
)
 
(1,276
)
Discount on debt
(12
)
 
(8,517
)
Total debt, net of debt discount and deferred financing costs
$
324

 
$
108,738

The total debt composition of the 2022 Notes is as follows (in thousands):
 
December 31,
 
2017
 
2016
2.375% convertible senior notes due 2022
$
345,000

 
$
—

Deferred financing costs
(7,482
)
 
—

Discount on debt
(61,345
)
 
—

Total debt, net of debt discount and deferred financing costs
$
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 (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Contractual interest expense
$
7,344

 
$
3,852

 
$
3,856

Amortization of debt issuance costs
1,381

 
612

 
615

Amortization of debt discount
10,423

 
4,088

 
4,102

Capitalized interest and other (Note 5)
(1,101
)
 
(1,491
)
 
(848
)
     Total
$
18,047

 
$
7,061

 
$
7,725

 
 
 
 
 
 
Effective interest rate on convertible senior notes
7.77
%
 
7.22
%
 
7.21
%