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Notes Payable and Amounts Due Under Repurchase Agreements (Tables)
12 Months Ended
Dec. 31, 2014
Notes Payable [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:
 
December 31, 2014
 
December 31, 2013
 
September
2015 Notes
 
September
2015 Notes
 
December
2029 Notes
 
(Dollars in thousands)
Notes payable:
 
 
 
 
 
Principal amount of liability component
$
22,377

 
$
91,951

 
$
68,373

Unamortized discount
(698
)
 
(6,623
)
 
(3,743
)
Net carrying amount of liability component
$
21,679

 
$
85,328

 
$
64,630

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

Amount by which the if-converted value exceeds principal
$
30,497

 
$
104,403

 
$
113,169