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Convertible Notes (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of debt The carrying values of the components of the 2014 Notes and the 2018 Notes are as follows (in thousands):
 
June 30, 2018
 
December 31, 2017
     2.75% 2014 Notes due 2034
 
 
 
Principal amount
$
51,250

 
$
201,250

Unamortized debt discount
(1,264
)
 
(5,087
)
Unamortized debt issuance cost
(230
)
 
(925
)
 
49,756

 
195,238

     2.75% 2018 Notes due 2034
 
 
 
Principal amount
150,000

 

Premium accretion of 2018 Notes
1,363

 

Unamortized debt discount
(32,253
)
 

Unamortized debt issuance cost
(2,108
)
 

 
117,002

 

 
$
166,758

 
$
195,238