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Notes Payable (Tables)
3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]  
Liability and Equity Components of Convertible Senior Notes
The carrying amount of the 2015 notes and the amount by which the if-converted value exceeds the outstanding principal for the 2015 notes is as follows:
 
March 31, 2015
 
December 31, 2014
 
(Dollars in thousands)
Principal amount of liability component
$
22,377

 
$
22,377

Unamortized discount
(458
)
 
(698
)
Net carrying amount of liability component
$
21,919

 
$
21,679

 
 
 
 
Amount by which the if-converted value exceeds principal
$
30,389

 
$
30,497