Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements of Income
Revenue		$ 274,202	$ 288,692
Expenses		265,862	273,998
Net income		3,352	9,748
Consolidated Balance Sheets
Total assets	[1]	2,462,927	2,364,948
Total liabilities	[2]	2,037,237	1,951,211
Total shareholders’ equity		375,885	364,015	$ 350,338
WMES
Consolidated Statements of Income
Revenue		29,596	38,086
Expenses		29,303	35,190
Net income		293	2,896
Consolidated Balance Sheets
Total assets		310,260	303,886
Total liabilities		225,917	219,836
Total shareholders’ equity		$ 84,343	$ 84,050

[1] Total assets at December 31, 2021 and 2020 include the following assets of variable interest entity’s (“VIE’s”) that can only be used to settle the liabilities of the VIE’s: Restricted cash $81,312 and $35,262; Equipment $1,226,395 and $1,037,684; Maintenance rights $5,433 and $767; Inventory $4,367 and $5,437; Notes receivable $90,868 and $26,392; and Other assets $4,775 and $558, respectively.

[2] Total liabilities at December 31, 2021 and 2020 include the following liabilities of VIEs for which the VIEs' creditors do not have recourse to Willis Lease Finance Corporation: Debt obligations $1,197,922 and $907,550, respectively.