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Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Scheduled maturities of all debt, including scheduled principal amortization | As of December 31, 2020, the scheduled maturities of all debt including scheduled principal amortization for years ended December 31 are as follows:
(in thousands) | Balloon Payments |  | Scheduled Principal Amortization |  | Total
2021 | $ | 11,012 |  |  | $ | 30,355 |  |  | $ | 41,367 |
2022 | 141,002 |  | (a) | 31,017 |  |  | 172,019 |
2023 | 84,225 |  |  | 31,481 |  |  | 115,706 |
2024 | 66,164 |  |  | 30,856 |  |  | 97,020 |
2025 | 20,363 |  |  | 27,860 |  |  | 48,223 |
Thereafter | 569,330 |  |  | 116,586 |  |  | 685,916 |
Principal amount | $ | 892,096 |  |  | $ | 268,155 |  |  | 1,160,251 |
Unamortized deferred debt costs |  |  |  |  | 9,337 |
Net |  |  |  |  | $ | 1,150,914 |
(a) Includes $104.5 million outstanding under the revolving facility.
Components of interest expense | The components of interest expense are set forth below.
(in thousands) | Year ended December 31,
| 2020 |  | 2019 |  | 2018
Interest incurred | $ | 51,705 |  |  | $ | 52,044 |  |  | $ | 49,652 |
Amortization of deferred debt costs | 1,570 |  |  | 1,518 |  |  | 1,610 |
Capitalized interest | (6,616) |  |  | (11,480) |  |  | (6,222) |
Interest expense | 46,659 |  |  | 42,082 |  |  | 45,040 |
Less: Interest income | 140 |  |  | 248 |  |  | 272 |
Interest expense, net and amortization of deferred debt costs | $ | 46,519 |  |  | $ | 41,834 |  |  | $ | 44,768 |

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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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