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Debt Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of notes payable | Debt obligations consisted of the following:
| As of December 31,
2020 |  | 2019
(in thousands)
Credit facility at a floating rate of interest of one-month LIBOR plus 1.38% at December 31, 2020, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2020, which revolves until the maturity date of June 2024 | $ | 777,000 |  |  | $ | 397,000 |
WEST V Series A 2020 term notes payable at a fixed rate of interest of 3.23%, maturing in March 2045, secured by engines | 286,863 |  |  | — |
WEST V Series B 2020 term notes payable at a fixed rate of interest of 4.21%, maturing in March 2045, secured by engines | 39,855 |  |  | — |
WEST V Series C 2020 term notes payable at a fixed rate of interest of 6.66%, maturing in March 2045, secured by engines | 19,043 |  |  | — |
WEST IV Series A 2018 term notes payable at a fixed rate of interest of 4.75%, maturing in September 2043, secured by engines | 277,481 |  |  | 307,014 |
WEST IV Series B 2018 term notes payable at a fixed rate of interest of 5.44%, maturing in September 2043, secured by engines | 39,640 |  |  | 43,859 |
WEST III Series A 2017 term notes payable at a fixed rate of interest of 4.69%, maturing in August 2042, secured by engines | 227,138 |  |  | 257,754 |
WEST III Series B 2017 term notes payable at a fixed rate of interest of 6.36%, maturing in August 2042, secured by engines | 32,481 |  |  | 36,860 |
WEST II Series A 2012 term notes payable at a fixed rate of interest of 5.50%, repaid in March 2020, secured by engines | — |  |  | 211,572 |
Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at December 31, 2020, maturing in July 2022, secured by engines | 6,138 |  |  | 7,286 |
Note payable at a fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft | 7,247 |  |  | 9,124 |
| 1,712,886 |  |  | 1,270,469 |
Less: unamortized debt issuance costs | (19,133) |  |  | (19,463) |
Total debt obligations | $ | 1,693,753 |  |  | $ | 1,251,006 |
Schedule or principal outstanding | Principal outstanding at December 31, 2020, is expected to be repayable as follows:
Year |  | (in thousands)
2021 |  | $ | 51,497 |
2022 |  | 57,341 |
2023 |  | 52,469 |
2024 |  | 828,636 |
2025 |  | 50,401 |
Thereafter |  | 672,542 |
Total |  | $ | 1,712,886 |

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