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Long-Term Debt (Tables) | 9 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Summary of Long-term Debt | The following table summarizes the Company’s long-term debt.
|  | September 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
4.25% Convertible senior notes, due March 1, 2037 |  | $ | 139,200 |  |  | $ | 143,750 |
3.95% Promissory note, due through February 17, 2020 |  |  | — |  |  |  | 8,881 |
4% Promissory note, due through July 29, 2020 |  |  | — |  |  |  | 7,345 |
3.75% Callable promissory note, due through September 1, 2036 |  |  | 7,695 |  |  |  | 7,955 |
4.55% Promissory note, due through August 1, 2036 |  |  | 5,529 |  |  |  | 5,704 |
3.90% Promissory note, due through April 1, 2032 |  |  | 9,861 |  |  |  | — |
Finance lease liabilities, due through August 15, 2023 |  |  | 48 |  |  |  | 60 |
Total principal amount |  |  | 162,333 |  |  |  | 173,695 |
Less: unamortized discount and issuance costs |  |  | (6,658 | ) |  |  | (10,000 | )
Total long-term debt |  | $ | 155,675 |  |  | $ | 163,695 |
Summary of Future Maturities of Long-Term Debt | The following table summarizes future maturities of long-term debt as of September 30, 2020, which takes into consideration the assumption that the 4.25% Convertible Senior Notes are repurchased at the earliest call date.
Due in 12 months following September 30, |  |  |  |
2020 |  | $ | 960 |
2021 |  |  | 140,198 |
2022 |  |  | 1,034 |
2023 |  |  | 1,063 |
2024 |  |  | 1,106 |
Thereafter |  |  | 17,972 |
Total |  | $ | 162,333 |
Schedule of Interest Expense Related to Long-Term Debt | Information with respect to interest expense related to long-term debt is as follows:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Interest Expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual interest |  | $ | 1,736 |  |  | $ | 1,835 |  |  | $ | 5,374 |  |  | $ | 6,229 |
Non-cash expense (a) |  |  | 1,053 |  |  |  | 1,018 |  |  |  | 3,174 |  |  |  | 3,807 |
Capitalized interest (b) |  |  | (41 | ) |  |  | (78 | ) |  |  | (125 | ) |  |  | (236 | )
|  | $ | 2,748 |  |  | $ | 2,775 |  |  | $ | 8,423 |  |  | $ | 9,800 |
| (a) | Includes amortization of debt discount and issuance costs.
| (b) | Interest was capitalized for a construction project.

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