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Notes Payable Level 3 (Tables)
 12 Months Ended
Dec. 31, 2012
Convertible Notes Payable [Abstract]  
Convertible Notes Payable [Table Text Block]
The liability and equity components of the 2024 notes and 2029 notes are accounted for separately in the consolidated balance sheets. The liability component of the 2015 notes and the liability and equity components of the 2024 notes and 2029 notes are as follows:
 
 
December 31, 2012
 
December 31, 2011
 
 
September 2015 Notes
 
December 2029 Notes
 
December 2024 Notes
 
September 2015 Notes
 
December 2029 Notes
 
December 2024 Notes
 
 
(Dollars in thousands)
 
(Dollars in thousands)
Notes payable:
 
 
 
 
 
 
 
 
 
 
 
 
Principal amount of liability component
 
$
200,000

 
$
115,839

 
$
28,243

 
$
200,000

 
$
115,839

 
$
28,243

Unamortized discount
 
(21,944
)
 
(12,269
)
 
—

 
(28,906
)
 
(17,568
)
 
—

Net carrying amount of liability component
 
$
178,056

 
$
103,570

 
$
28,243

 
$
171,094

 
$
98,271

 
$
28,243

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

 
$
22,637

 
 
 
$
15,586

 
$
22,637

Amount by which the if-converted value exceeds principal
 
$
—

 
$
30,382

 
$
—

 
$
—

 
$
8,846

 
$
—