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Notes Payable and Amounts Due Under Repurchase Agreements Notes Payable and Amounts Due Under Repurchase Agreements (Tables)
12 Months Ended
Dec. 31, 2013
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, 2013
 
December 31, 2012
 
September
2015 Notes
 
December
2029 Notes
 
September
2015 Notes
 
December
2029 Notes
 
December
2024 Notes
 
(Dollars in thousands)
 
(Dollars in thousands)
Notes payable:
 
 
 
 
 
 
 
 
 
Principal amount of liability component
$
91,951

 
$
68,373

 
$
200,000

 
$
115,839

 
$
28,243

Unamortized discount
(6,623
)
 
(3,743
)
 
(21,944
)
 
(12,269
)
 

Net carrying amount of liability component
$
85,328

 
$
64,630

 
$
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
$
104,403

 
$
113,169

 
$

 
$
30,382

 
$