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

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

 
 
Equity component carrying value
$
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, 2014 and thereafter are as follows (in thousands):
Years ending December 31,
 
2015
$
9,630

2016
11,137

2017
12,632

2018
14,240

2019
114,041

2020 and thereafter
337

 
$
162,017
Convertible subordinated notes  
Debt Instrument [Line Items]  
Schedule of Maturities of Long-term Debt
The aggregate maturities of our convertible subordinated notes for the five years subsequent to December 31, 2014 and thereafter are as follows (in thousands):
 
 
Principal Maturity
 
Discount Amortization
 
Present
 Value
Years ending December 31,
 
 
 
 
 
 
2015
 
$
—

 
$
(3,455
)
 
$
(3,455
)
2016
 
—

 
(3,867
)
 
(3,867
)
2017
 
—

 
(4,328
)
 
(4,328
)
2018
 
—

 
(4,844
)
 
(4,844
)
2019
 
—

 
(5,422
)
 
(5,422
)
2020 and thereafter
 
143,750

 
(7,292
)
 
136,458

 
 
$
143,750

 
$
(29,208
)
 
$
114,542