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Convertible Notes | 3 Months Ended
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Mar. 31, 2014
Debt Disclosure [Abstract] |
Convertible Notes | Convertible Notes The Company’s convertible notes are shown in the following table:
(In thousands) |  | As of March 31, 2014 |  | As of December 31, 2013
5% Convertible Senior Notes due 2014 |  | $ | 172,500 |  |  | $ | 172,500 |
1.125% Convertible Senior Notes due 2018 |  | 138,000 |  |  | 138,000 |
Total principal amount of convertible notes |  | $ | 310,500 |  |  | $ | 310,500 |
Unamortized discount - 2014 Notes |  | $ | (3,842 | ) |  | $ | (8,453 | )
Unamortized discount - 2018 Notes |  | (27,038 | ) |  | (28,371 | )
Total unamortized discount |  | $ | (30,880 | ) |  | $ | (36,824 | )
Total convertible notes |  | $ | 279,620 |  |  | $ | 273,676 |
Less current portion |  | 168,658 |  |  | 164,047 |
Total long-term convertible notes |  | $ | 110,962 |  |  | $ | 109,629 |
The 2014 Notes are classified as a short-term liability as they will be due on June 15, 2014. Interest expense related to the notes for the three months ended March 31, 2014 and 2013 was as follows:
| Three Months Ended
| March 31,
| 2014 |  | 2013
| (In thousands)
2014 Notes coupon interest at a rate of 5% | $ | 2,156 |  |  | $ | 2,157 |
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7% | 4,769 |  |  | 4,089 |
2018 Notes coupon interest at a rate of 1.125% | 388 |  |  | — |
2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5% | 1,473 |  |  | — |
Total interest expense on convertible notes | $ | 8,786 |  |  | $ | 6,246 |

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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