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Notes Payable (Tables) | 3 Months Ended
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Mar. 31, 2014
Debt Disclosure [Abstract] |
Liability and Equity Components of Convertible Senior Notes | The 5.25% Contingent Convertible Senior Notes due December 15, 2029 (the "2029 notes") are accounted for separately as a liability component and an equity component in the consolidated balance sheets. The carrying amount of the 2015 notes and the 2029 notes, the carrying amount of the equity component of the 2029 notes and the amount by which the if-converted value exceeds the outstanding principal for both the 2015 notes and the 2029 notes are as follows:
| March 31, 2014 |  | December 31, 2013
| September 2015 Notes |  | December 2029 Notes |  | September 2015 Notes |  | December 2029 Notes
| (Dollars in thousands)
Notes payable: |  |  |  |  |  |  |
Principal amount of liability component | $ | 91,951 |  |  | $ | 37,032 |  |  | $ | 91,951 |  |  | $ | 68,373 |
Unamortized discount | (5,712 | ) |  | (1,513 | ) |  | (6,623 | ) |  | (3,743 | )
Net carrying amount of liability component | $ | 86,239 |  |  | $ | 35,519 |  |  | $ | 85,328 |  |  | $ | 64,630 |
Additional paid-in capital: |  |  |  |  |  |  |
Carrying amount of equity component |  |  | $ | 4,983 |  |  |  |  | $ | 15,586 |
Amount by which the if-converted value exceeds principal | $ | 83,860 |  |  | $ | 56,960 |  |  | $ | 104,403 |  |  | $ | 113,169 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Details
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