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Debt Obligations (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of notes payable | Debt obligations consisted of the following:
| As of December 31,
2021 |  | 2020
(in thousands)
Credit facility at a floating rate of interest of one-month LIBOR plus 1.75% at December 31, 2021, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2021, which revolves until the maturity date of June 2024 | $ | 590,000 |  |  | $ | 777,000 |
WEST VI Series A 2021 term notes payable at a fixed rate of interest of 3.10%, maturing in May 2046, secured by engines | 273,723 |  |  | — |
WEST VI Series B 2021 term notes payable at a fixed rate of interest of 5.44%, maturing in May 2046, secured by engines | 38,022 |  |  | — |
WEST VI Series C 2021 term notes payable at a fixed rate of interest of 7.39%, maturing in May 2046, secured by engines | 18,158 |  |  | — |
WEST V Series A 2020 term notes payable at a fixed rate of interest of 3.23%, maturing in March 2045, secured by engines | 272,909 |  |  | 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 | 38,004 |  |  | 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 | 16,342 |  |  | 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 | 262,260 |  |  | 277,481 |
WEST IV Series B 2018 term notes payable at a fixed rate of interest of 5.44%, maturing in September 2043, secured by engines | 38,885 |  |  | 39,640 |
WEST III Series A 2017 term notes payable at a fixed rate of interest of 4.69%, maturing in August 2042, secured by engines | 223,815 |  |  | 227,138 |
WEST III Series B 2017 term notes payable at a fixed rate of interest of 6.36%, maturing in August 2042, secured by engines | 32,195 |  |  | 32,481 |
Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50%, repaid in May 2021, secured by engines | — |  |  | 6,138 |
Note payable at a fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft | 5,307 |  |  | 7,247 |
| 1,809,620 |  |  | 1,712,886 |
Less: unamortized debt issuance costs | (19,356) |  |  | (19,133) |
Total debt obligations | $ | 1,790,264 |  |  | $ | 1,693,753 |
Schedule or principal outstanding | Principal outstanding at December 31, 2021, is expected to be repayable as follows:
Year |  | (in thousands)
2022 |  | $ | 79,726 |
2023 |  | 63,069 |
2024 |  | 652,236 |
2025 |  | 61,001 |
2026 |  | 280,029 |
Thereafter |  | 673,559 |
Total |  | $ | 1,809,620 |

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