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Debt Obligations - Schedule of Notes Payable (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2018
Long Term Debt |  |  |
Gross amount of debt | $ 1,317,670 |  | $ 1,358,430
Less: unamortized debt issuance costs | (19,834) |  | (21,081)
Total debt obligations | 1,297,836 |  | 1,337,349
Credit facility at a floating rate of interest of one-month LIBOR plus 1.5% at March 31, 2019, secured by engines. The facility has a committed amount of $890.0 million at March 31, 2019, which revolves until the maturity date of April 2021 |  |  |
Long Term Debt |  |  |
Line of credit facility outstanding amount | 392,000 |  | 427,000
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 |  |  |
Gross amount of debt | $ 319,390 |  | 323,075
Fixed rate (as a percent) | 4.75% |  |
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 |  |  |
Gross amount of debt | $ 45,627 |  | 46,154
Fixed rate (as a percent) | 5.44% |  |
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 |  |  |
Gross amount of debt | $ 270,901 |  | 274,205
Fixed rate (as a percent) | 4.69% |  |
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 |  |  |
Gross amount of debt | $ 38,740 |  | 39,212
Fixed rate (as a percent) | 6.36% |  |
WEST II Series A 2012 term notes payable at a fixed rate of interest of 5.50%, maturing in September 2037, secured by engines |  |  |
Long Term Debt |  |  |
Gross amount of debt | $ 232,409 |  | 237,847
Fixed rate (as a percent) | 5.50% |  |
Note payable at three-month LIBOR plus a margin ranging from 1.85% to 5.25% at March 31, 2019, maturing in July 2022, secured by engines |  |  |
Long Term Debt |  |  |
Gross amount of debt | $ 8,120 | $ 8,100 | 0
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024, secured by an aircraft |  |  |
Long Term Debt |  |  |
Gross amount of debt | $ 10,483 |  | $ 10,937
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024, secured by an aircraft | Minimum |  |  |
Long Term Debt |  |  |
Variable rate spread | 2.60% |  |
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024, secured by an aircraft | Maximum |  |  |
Long Term Debt |  |  |
Variable rate spread | 2.97% |  |
LIBOR | Credit facility at a floating rate of interest of one-month LIBOR plus 1.5% at March 31, 2019, secured by engines. The facility has a committed amount of $890.0 million at March 31, 2019, which revolves until the maturity date of April 2021 |  |  |
Long Term Debt |  |  |
Variable rate spread | 1.50% |  |
LIBOR | Note payable at three-month LIBOR plus a margin ranging from 1.85% to 5.25% at March 31, 2019, maturing in July 2022, secured by engines | Minimum |  |  |
Long Term Debt |  |  |
Variable rate spread | 1.85% |  |
LIBOR | Note payable at three-month LIBOR plus a margin ranging from 1.85% to 5.25% at March 31, 2019, maturing in July 2022, secured by engines | Maximum |  |  |
Long Term Debt |  |  |
Variable rate spread | 5.25% |  |

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