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Convertible Senior Notes | 6 Months Ended
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Jun. 30, 2013
Debt Disclosure [Abstract] |
Convertible Senior Notes | Convertible Senior Notes In May 2005, we issued $250.0 million aggregate principal amount of 3.625% convertible senior notes due 2025 (“3.625% convertible senior notes”), and in November 2005, we issued $300.0 million aggregate principal amount of 5.875% convertible senior notes due 2035 (“5.875% convertible senior notes”). These notes (net of repurchases since the issuance dates) are reflected within convertible senior notes on our consolidated balance sheets. In May 2012, substantially all of the holders of our 3.625% convertible senior notes exercised a then-existing put right, under which we repaid $83.5 million in face amount of such notes outstanding at par. No such put rights exist under our 5.875% convertible senior notes. The following summarizes (in thousands) components of our consolidated balance sheets associated with our convertible senior notes:
| As of
| June 30, 2013 |  | December 31, 2012
Face amount of 3.625% convertible senior notes | $ | 450 |  |  | $ | 450 |
Face amount of 5.875% convertible senior notes | 139,467 |  |  | 139,467 |
Discount | (44,289 | ) |  | (44,582 | )
Net carrying value | $ | 95,628 |  |  | $ | 95,335 |
Carrying amount of equity component included in additional paid-in capital | $ | 108,714 |  |  | $ | 108,714 |
Excess of instruments’ if-converted values over face principal amounts | $ | — |  |  | $ | — |

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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