Debt Obligations (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Notes Payable

Debt obligations consisted of the following:

	As of December 31,
	2023		2022
	(in thousands)
Credit facility at a floating rate of interest of one-month term Secured Overnight Financing Rate (“SOFR”) plus 1.75% at December 31, 2023, secured by engines. The facility has a committed amount of $708.0 million at December 31, 2023. $49.8 million revolves until the earlier of the final WEST VII novated asset or the maturity date of March 31, 2024, $158.2 million revolves until the maturity date of June 2024, and $500.0 million revolves until the maturity date of June 2025.	$	353,000	$	727,000
WEST VII Series A 2023 term notes payable at a fixed rate of interest of 8.00%, maturing in October 2048, secured by engines	406,894		—
WEST VI Series A 2021 term notes payable at a fixed rate of interest of 3.10%, maturing in May 2046, secured by engines	252,986		262,779
WEST VI Series B 2021 term notes payable at a fixed rate of interest of 5.44%, maturing in May 2046, secured by engines	35,142		36,502
WEST VI Series C 2021 term notes payable at a fixed rate of interest of 7.39%, maturing in May 2046, secured by engines	12,361		14,738
WEST V Series A 2020 term notes payable at a fixed rate of interest of 3.23%, maturing in March 2045, secured by engines	240,371		255,136
WEST V Series B 2020 term notes payable at a fixed rate of interest of 4.21%, maturing in March 2045, secured by engines	33,485		35,542
WEST V Series C 2020 term notes payable at a fixed rate of interest of 6.66%, maturing in March 2045, secured by engines	10,695		13,314
WEST IV Series A 2018 term notes payable at a fixed rate of interest of 4.75%, maturing in September 2043, secured by engines	212,157		238,072
WEST IV Series B 2018 term notes payable at a fixed rate of interest of 5.44%, maturing in September 2043, secured by engines	29,024		36,386
WEST III Series A 2017 term notes payable at a fixed rate of interest of 4.69%, maturing in August 2042, secured by engines	175,705		209,061
WEST III Series B 2017 term notes payable at a fixed rate of interest of 6.36%, maturing in August 2042, secured by engines	23,592		30,255
Note payable at a fixed rate of interest of 4.59%, maturing in January 2032, secured by an engine	22,610		—
Note payable at a fixed rate of interest of 4.23%, maturing in July 2031, secured by an engine	17,802		—
Note payable at a fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft	1,235		3,304
	1,827,059		1,862,089
Less: unamortized debt issuance costs and note discounts	(24,178)		(14,811)
Total debt obligations	$	1,802,881	$	1,847,278

Schedule or Principal Outstanding

Principal outstanding at December 31, 2023, is expected to be repayable as follows:

Year	(in thousands)
2024	$	73,206
2025	424,958
2026	271,175
2027	193,761
2028	239,778
Thereafter	624,181
Total	$	1,827,059