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Indebtedness (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Net carrying amount of the debt component

The carrying values of the Company’s Senior Convertible Notes are as follows (in thousands):

 

(in thousands)

 

December 31, 2016

 

 

December 31, 2015

 

2.75% Senior Convertible Notes due 2017:

 

 

 

 

 

 

 

 

Principal amount

 

$

63,317

 

 

$

402,500

 

Unamortized debt discount

 

 

(1,417

)

 

 

(25,958

)

Unamortized debt issuance costs

 

 

(199

)

 

 

(3,622

)

 

 

 

61,701

 

 

 

372,920

 

2.25% Senior Convertible Notes due 2021:

 

 

 

 

 

 

 

 

Principal amount

 

 

650,000

 

 

 

—

 

Unamortized debt discount

 

 

(72,713

)

 

 

—

 

Unamortized debt issuance costs

 

 

(12,875

)

 

 

—

 

 

 

 

564,412

 

 

 

—

 

Total Senior Convertible Notes

 

$

626,113

 

 

$

372,920

 

 

 

 

 

 

 

 

 

 

Less Current Portion:

 

 

(61,701

)

 

 

—

 

Long-term Senior Convertible Notes

 

$

564,412

 

 

$

372,920