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Notes Payable Level 3 (Tables) | 3 Months Ended
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Mar. 31, 2013
Convertible Notes Payable [Abstract] |
Convertible Notes Payable [Table Text Block] | The contingent 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:
| March 31, 2013 |  | December 31, 2012
| 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 | (20,151 | ) |  | (10,888 | ) |  | — |  |  | (21,944 | ) |  | (12,269 | ) |  | — |
Net carrying amount of liability component | $ | 179,849 |  |  | $ | 104,951 |  |  | $ | 28,243 |  |  | $ | 178,056 |  |  | $ | 103,570 |  |  | $ | 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 | $ | 41,065 |  |  | $ | 64,395 |  |  | $ | 2,364 |  |  | $ | — |  |  | $ | 30,382 |  |  | $ | — |

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- Definition Tabular presentation of convertible debt elements (principal amount outstanding, unamortized debt discount, net carrying amount of liability component, carrying amount of equity component and amount by which the if-converted value exceeds principal outstanding). + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration