Investments - Schedule of Financial Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Income
Revenue		$ 89,535	$ 68,817
Expenses		81,537	93,922
Net income (loss)		4,394	(21,201)
Consolidated Balance Sheets
Total assets	[1]	2,587,334		$ 2,575,217
Total liabilities	[2]	2,131,435		2,120,640
Total WMES net equity		405,989	371,007	404,688	$ 375,885
WMES
Consolidated Statements of Income
Revenue		10,878	9,541
Expenses		11,165	15,003
Net income (loss)		(287)	$ (5,462)
Consolidated Balance Sheets
Total assets		240,905		267,580
Total liabilities		156,363		183,083
Total WMES net equity		$ 84,542		$ 84,497

[1] Total assets at March 31, 2023 and December 31, 2022, include the following assets of variable interest entities (“VIEs”) that can only be used to settle the liabilities of the VIEs: Restricted cash $54,684 and $76,870; Equipment $1,183,337 and $1,167,970; Maintenance Rights $6,822 and $5,433; Notes receivable $79,502 and $80,220; and Other assets $6,543 and $6,470 (each respectively).

[2] Total liabilities at March 31, 2023 and December 31, 2022, include the following liabilities of VIEs for which the VIEs’ creditors do not have recourse to Willis Lease Finance Corporation: Debt obligations $1,093,537 and $1,118,721, respectively.