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Notes Payable (Tables)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Liability and Equity Components of Convertible Senior Notes
The convertible senior notes included in notes payable are accounted for separately as a liability component and an equity component in the consolidated balance sheets. The liability component and equity component are as follows:
 
September 30, 2013
 
December 31, 2012
 
September 2015 Notes
 
December 2029 Notes
 
September 2015 Notes
 
December 2029 Notes
 
December 2024 Notes
 
(Dollars in thousands)
Notes payable:
 
 
 
 
 
 
 
 
 
Principal amount of liability component
$
200,000

 
$
115,839

 
$
200,000

 
$
115,839

 
$
28,243

Unamortized discount
(16,420
)
 
(7,967
)
 
(21,944
)
 
(12,269
)
 
—

Net carrying amount of liability component
$
183,580

 
$
107,872

 
$
178,056

 
$
103,570

 
$
28,243

Additional paid-in capital:
 
 
 
 
 
 
 
 
 
Carrying amount of equity component
 
 
$
15,586

 
 
 
$
15,586

 
$
22,637

Amount by which the if-converted value exceeds principal
$
54,179

 
$
138,958

 
$
—

 
$
30,382

 
$
—