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Convertible Subordinated Notes (Tables)
12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Convertible Subordinated Notes, Carrying Values of Liability and Equity Components
The carrying values of the liability and equity components of the Convertible Notes at December 31, 2015 are reflected on our Consolidated Balance Sheets as follows (in thousands):
 
December 31, 2014
 
December 31, 2015
Long-term liabilities:
 
 
 
Principal amount
$
143,750

 
$
143,750

Unamortized discount of liability component
(29,208
)
 
(25,754
)
Carrying value of the liability component
$
114,542

 
$
117,996

 
 
 
 
Equity component carrying value
$
17,973

 
$
17,973

Schedule of Maturities of Long-term Debt
The aggregate maturities of our long-term debt for the next five years subsequent to December 31, 2015 and thereafter are as follows (in thousands):
Years ending December 31,
 
2016
$
12,012

2017
13,499

2018
15,184

2019
167,168

2020
383

2021 and thereafter
220

 
$
208,466

The aggregate maturities of our Convertible Notes for the five years subsequent to December 31, 2015 and thereafter are as follows (in thousands):
 
 
Principal Maturity
 
Discount Amortization
 
Present
 Value
Years ending December 31,
 
 
 
 
 
 
2016
 
$

 
$
(3,867
)
 
$
(3,867
)
2017
 

 
(4,328
)
 
(4,328
)
2018
 

 
(4,844
)
 
(4,844
)
2019
 

 
(5,422
)
 
(5,422
)
2020
 

 
(6,068
)
 
(6,068
)
2021 and thereafter
 
143,750

 
(1,225
)
 
142,525

 
 
$
143,750

 
$
(25,754
)
 
$
117,996