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Convertible Subordinated Notes | 9 Months Ended
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Sep. 30, 2017
Convertible Subordinated Notes [Abstract] |
Convertible Subordinated Notes | CONVERTIBLE SUBORDINATED NOTES On March 19, 2014, we issued $143.75 million aggregate principal amount of 2.75% convertible subordinated notes due March 15, 2021 (the “Convertible Notes”). The Convertible Notes bear interest at 2.75% per year. Interest on the Convertible Notes began to accrue on March 19, 2014 and is payable semi-annually in arrears on March 15 and September 15 of each year. The carrying values of the liability and equity components of the Convertible Notes at December 31, 2016 and September 30, 2017 are reflected in our Consolidated Balance Sheets as follows (in thousands):
| December 31, 2016 |  | September 30, 2017
Long-term liabilities: |  |  |
Principal amount | $ | 143,750 |  |  | $ | 143,750 |
Unamortized discount of liability component | (21,887 | ) |  | (18,687 | )
Convertible Notes issuance costs, net of accumulated amortization of $1,359 and $1,746, respectively | $ | (2,268 | ) |  | $ | (1,881 | )
Carrying value of the liability component | $ | 119,596 |  |  | $ | 123,182 |
Equity component carrying value | $ | 17,973 |  |  | $ | 17,973 |
The fair value of the Convertible Notes, which are Level 2 measurements, was approximately $179.9 million at September 30, 2017. Interest expense on the Convertible Notes included contractual coupon interest expense of approximately $1.0 million for both the three months ended September 30, 2016 and 2017 and $3.0 million for both the nine months ended September 30, 2016 and 2017. Accretion of the discount on the Convertible Notes was $1.0 million and $1.1 million for the three months ended September 30, 2016 and 2017, respectively, and $2.9 million and $3.2 million for the nine months ended September 30, 2016 and 2017, respectively. Amortization of debt issuance costs related to our Convertible Notes was approximately $0.1 million for both the three months ended September 30, 2016 and 2017 and $0.4 million for both the nine months ended September 30, 2016 and 2017. The initial conversion rate of the Convertible Notes, as of March 19, 2014, was 44.3169 shares of our common stock per $1,000 principal amount of Convertible Notes, equivalent to an initial conversion price of approximately $22.56 per share of common stock. The adjusted conversion rate of the Convertible Notes, in effect at September 30, 2017, is 44.5392 shares of our common stock per $1,000 principal amount of Convertible Notes, equivalent to an adjusted conversion price of approximately $22.45 per share of common stock. The unamortized discount and the unamortized debt issuance costs are being amortized using the effective interest method over the remaining term of the Convertible Notes. The effective interest rate on the unamortized discount and the debt issuance costs for both the three and nine months ended September 30, 2016 and 2017 was 6.75% and 2.75%, respectively.

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