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Debt Obligations - Schedule of Notes Payable (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Long Term Debt |  |
Gross amount of debt | $ 1,742,269,000 | $ 1,712,886,000
Less: unamortized debt issuance costs | (18,139,000) | (19,133,000)
Total debt obligations | 1,724,130,000 | 1,693,753,000
Credit facility at a floating rate of interest of one-month LIBOR plus 1.75% at March 31, 2021, secured by engines. The facility has a committed amount of $1.0 billion at March 31, 2021, which revolves until the maturity date of June 2024 |  |
Long Term Debt |  |
Line of credit facility outstanding amount | $ 817,000,000 | 777,000,000
WEST V Series A 2020 term notes payable at a fixed rate of interest of 3.23%, maturing in March 2045, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 3.23% |
Gross amount of debt | $ 283,533,000 | 286,863,000
WEST V Series B 2020 term notes payable at a fixed rate of interest of 4.21%, maturing in March 2045, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 4.21% |
Gross amount of debt | $ 39,395,000 | 39,855,000
WEST V Series C 2020 term notes payable at a fixed rate of interest of 6.66%, maturing in March 2045, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 6.66% |
Gross amount of debt | $ 18,617,000 | 19,043,000
WEST IV Series A 2018 term notes payable at a fixed rate of interest of 4.75%, maturing in September 2043, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 4.75% |
Gross amount of debt | $ 275,042,000 | 277,481,000
WEST IV Series B 2018 term notes payable at a fixed rate of interest of 5.44%, maturing in September 2043, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 5.44% |
Gross amount of debt | $ 39,476,000 | 39,640,000
WEST III Series A 2017 term notes payable at a fixed rate of interest of 4.69%, maturing in August 2042, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 4.69% |
Gross amount of debt | $ 224,401,000 | 227,138,000
WEST III Series B 2017 term notes payable at a fixed rate of interest of 6.36%, maturing in August 2042, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 6.36% |
Gross amount of debt | $ 32,195,000 | 32,481,000
Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at March 31, 2021, maturing in July 2022, secured by engines |  |
Long Term Debt |  |
Gross amount of debt | $ 5,843,000 | 6,138,000
Note payable at a fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft |  |
Long Term Debt |  |
Fixed rate (as a percent) | 3.18% |
Gross amount of debt | $ 6,767,000 | $ 7,247,000
Revolving credit facility | Credit facility at a floating rate of interest of one-month LIBOR plus 1.75% at March 31, 2021, secured by engines. The facility has a committed amount of $1.0 billion at March 31, 2021, which revolves until the maturity date of June 2024 |  |
Long Term Debt |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000,000.0 |
LIBOR | Credit facility at a floating rate of interest of one-month LIBOR plus 1.75% at March 31, 2021, secured by engines. The facility has a committed amount of $1.0 billion at March 31, 2021, which revolves until the maturity date of June 2024 |  |
Long Term Debt |  |
Variable rate (as a percent) | 1.75% |
LIBOR | Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at March 31, 2021, maturing in July 2022, secured by engines | Minimum |  |
Long Term Debt |  |
Variable rate (as a percent) | 1.85% |
LIBOR | Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at March 31, 2021, maturing in July 2022, secured by engines | Maximum |  |
Long Term Debt |  |
Variable rate (as a percent) | 2.50% |

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