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Long-Term Debt (Tables) | 9 Months Ended
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Sep. 30, 2016
Debt Disclosure [Abstract] |
Summary of Long-term Debt | The following table summarizes the Company’s long-term debt:
|  | September 30, |  |  | December 31, |
|  | 2016 |  |  | 2015 |
8% Senior Notes, due January 30, 2020 |  | $ | 40,250 |  |  | $ | 40,250 |
3.875% Convertible Senior Notes, due March 15, 2019 |  |  | 89,990 |  |  |  | 103,000 |
4% Promissory note, due through February 1, 2031 |  |  | 8,936 |  |  |  | — |
3.75% Promissory note, due through September 1, 2036 |  |  | 9,000 |  |  |  | — |
Total principal amount |  |  | 148,176 |  |  |  | 143,250 |
Less: unamortized discount and issuance costs |  |  | (10,004 | ) |  |  | (13,821 | )
Total long-term debt |  | $ | 138,172 |  |  | $ | 129,429 |
Summary of Future Maturities of Long-Term Debt | As of September 30, 2016, future maturities of long-term debt are as follows:
Due in 12 months following September 30, |  |  |  |
2016 |  | $ | 776 |
2017 |  |  | 807 |
2018 |  |  | 90,829 |
2019 |  |  | 41,122 |
2020 |  |  | 906 |
Thereafter |  |  | 13,736 |
Total |  | $ | 148,176 |
Schedule of Interest Expense | Information with respect to interest expense is as follows:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Interest Expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual interest |  | $ | 1,810 |  |  | $ | 1,802 |  |  | $ | 5,466 |  |  | $ | 5,408 |
Non-cash expense* |  |  | 862 |  |  |  | 896 |  |  |  | 2,646 |  |  |  | 2,630 |
|  | $ | 2,672 |  |  | $ | 2,698 |  |  | $ | 8,112 |  |  | $ | 8,038 |
* | Includes amortization of debt discount and issuance costs.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + 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 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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