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Notes Payable Level 3 (Tables)
 9 Months Ended
Sep. 30, 2012
Debt Instrument [Line Items]  
Convertible Notes Payable [Table Text Block]
 
 
September 30, 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)
Notes payable:
 
 
 
 
 
 
 
 
 
 
 
 
Principal amount of liability component
 
$
200,000

 
$
115,839

 
$
28,243

 
$
200,000

 
$
115,839

 
$
28,243

Unamortized discount
 
(23,736
)
 
(13,650
)
 
—

 
(28,906
)
 
(17,568
)
 
—

Net carrying amount of liability component
 
$
176,264

 
$
102,189

 
$
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
 
$
—

 
$
23,193

 
$
—

 
$
—

 
$
8,489

 
$
—