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DEBT (Tables)
 12 Months Ended
Dec. 31, 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):
 
December 31,
 
2018
 
2017
2.375% convertible senior notes due 2022
$
345,000

 
$
345,000

Deferred financing costs
(5,850
)
 
(7,482
)
Discount on debt
(48,558
)
 
(61,345
)
Total debt, net of debt discount and deferred financing costs
$
290,592

 
$
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):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Contractual interest expense
$
8,205

 
$
7,344

 
$
3,852

Amortization of debt issuance costs
1,634

 
1,381

 
612

Amortization of debt discount
12,799

 
10,423

 
4,088

Capitalized interest and other (Note 6)
(689
)
 
(1,101
)
 
(1,491
)
     Total
$
21,949

 
$
18,047

 
$
7,061

 
 
 
 
 
 
Effective interest rate on convertible senior notes
7.81
%
 
7.77
%
 
7.22
%