Organization and Summary of Significant Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Willis Lease Finance Corporation with its subsidiaries is a provider of aviation services whose primary focus is providing operating leases of commercial aircraft, aircraft engines and other aircraft-related equipment to air carriers, manufacturers and overhaul/repair facilities worldwide. The Company also engages in the selective purchase and resale of commercial aircraft engines. Willis Aeronautical Services, Inc. (“Willis Aero”) is a wholly-owned subsidiary whose primary focus is the sale of aircraft engine parts and materials through the acquisition or consignment of aircraft and engines. Willis Asset Management Limited (“Willis Asset Management”) is a wholly-owned subsidiary whose primary focus is the engine management and consulting business. Willis Engine Securitization Trust II (“WEST II” or the “WEST II Notes”) is a bankruptcy remote special purpose vehicle which was established for the purpose of financing aircraft engines through an asset-backed securitization (“ABS”), of which the Company is the sole beneficiary. WEST II is a variable interest entity (“VIE”) which the Company owns 100% of the interest and consolidates in its financial statements. In August 2017, the Company closed on Willis Engine Securitization Trust III (“WEST III” or the “WEST III Notes”), a bankruptcy remote special purpose vehicle, which was established for the purpose of financing aircraft engines through an ABS, of which the Company is the sole beneficiary. The WEST III Notes were issued in two series, with the Series A Notes issued in an aggregate principal amount of $293.7 million and the Series B Notes in an aggregate principal amount of $42.0 million. The Company used these funds, net of transaction expenses, to pay off part of its revolving credit facility. WEST III is a VIE which the Company owns 100% of the interest and consolidates in its financial statements. In August 2018, the Company closed on Willis Engine Securitization Trust IV (“WEST IV” or the “WEST IV Notes”), a bankruptcy remote special purpose vehicle, which was established for the purpose of financing aircraft engines through an ABS, of which the Company is the sole beneficiary. The WEST IV Notes were issued in two series, with the Series A Notes issued in an aggregate principal amount of $326.8 million and the Series B Notes in an aggregate principal amount of $46.7 million. WEST IV is a VIE which the Company owns 100% of the interest and consolidates in its financial statements. Principal and interest on the WEST II, III and IV Notes are payable monthly to the extent of available cash in accordance with a priority of payments included in the respective indenture agreements. The WEST II, III and IV Notes are secured by, among other things, the respective ABS’s direct and indirect interests in a portfolio of assets. The WEST II, WEST III and WEST IV Notes have scheduled amortizations and are payable solely from revenue received from the engines and the engine leases, after payment of certain expenses of the respective ABS. The assets of WEST II, WEST III and WEST IV are not available to satisfy the Company’s obligations other than the obligations specific to the respective ABS. WEST II, WEST III and WEST IV are consolidated for financial statement presentation purposes, with the respective assets and liabilities on the Company's balance sheet. The ABS’ ability to make distributions and pay dividends to the Company is subject to the prior payments of its debt and other obligations and maintenance of adequate reserves and capital. Under each ABS, cash is collected in a restricted account, which is used to service the debt and any remaining amounts, after debt service and defined expenses, are distributed to the Company. Additionally, a portion of the maintenance reserve payments and lease security deposits are formulaically accumulated in restricted accounts and are available to fund future maintenance events and to secure lease payments, respectively. Additionally, in connection with WEST II, WEST III and WEST IV, the Company entered into servicing agreements and administrative agency agreements to provide certain engine, lease management and reporting functions in return for fees based on a percentage of collected lease revenues and asset sales. Because WEST II, WEST III and WEST IV are consolidated for financial statement reporting purposes, all fees eliminate upon consolidation.
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements include the accounts of WLFC and its wholly owned subsidiaries, including VIEs where the Company is the primary beneficiary, in accordance with consolidation guidance. The Company evaluates all entities in which it has an economic interest firstly to determine whether for accounting purposes the entity is a variable interest entity or voting interest entity. If the entity is a variable interest entity the Company consolidates the financial statements of that entity if it is the primary beneficiary of the entities’ activities. If the entity is a voting interest entity the Company consolidates the entity when it has a majority of voting interests. Intercompany transactions and balances have been eliminated in consolidation. The condensed parent company financial statements should be read in conjunction with the Company’s consolidated financial statements and the accompanying notes herein.
Revenue Recognition	Revenue Recognition Leasing revenue Revenue from leasing of engines, aircraft and related parts and equipment is recognized as operating lease revenue on a straight-line basis over the terms of the applicable lease agreements. Revenue is not recognized when cash collection is not reasonably assured. When collectability is not reasonably assured, the customer is placed on non-accrual status and revenue is recognized when cash payments are received. Under the terms of some of the Company’s leases, the lessees pay use fees (also known as maintenance reserves) to the Company based on usage of the leased asset, which are designed to cover expected future maintenance costs. Some of these amounts are reimbursable to the lessee if they make specifically defined maintenance expenditures. Use fees received are recognized in revenue as maintenance reserve revenue if they are not reimbursable to the lessee. Use fees that are reimbursable are recorded as a maintenance reserve liability until they are reimbursed to the lessee, the lease terminates, or the obligation to reimburse the lessee for such reserves ceases to exist, at which time they are recognized in revenue as maintenance reserve revenue. Certain lessees may be significantly delinquent in their rental payments and may default on their lease obligations. As of December 31, 2019, the Company had an aggregate of approximately $2.7 million in lease rent and $3.8 million in maintenance reserve receivables more than 30 days past due. Inability to collect receivables or to repossess engines or other leased equipment in the event of a default by a lessee could have a material adverse effect on the Company. The Company estimates an allowance for doubtful accounts for receivables it does not consider fully collectible. The allowance for doubtful accounts includes the following: (1) specific reserves for receivables which are impaired for which management believes full collection is doubtful; and (2) a general reserve for estimated losses based on historical experience. No customer accounted for greater than 10% of total lease rent revenue in 2019 and 2018. Gain on sale of leased equipment The Company regularly sells equipment from its lease portfolio. This equipment may or may not be subject to a lease at the time of sale. The net gain or loss on such sales is recognized as revenue and consists of proceeds associated with the sale less the net book value of the asset sold and any direct costs associated with the sale. To the extent that deposits associated with the equipment are not included in the sale, any such amount is included in the calculation of gain or loss. Spare parts sales The Spare Parts Sales reportable segment primarily engages in the sale of aircraft engine parts and materials through the acquisition or consignment of engines from third parties or the Company’s leasing operations. The parts are sold at a fixed price with no right of return. In determining the performance obligation, management has identified the promise in the contract to be the shipment of the spare parts to the customer. Title passes to the buyer when the goods are shipped, and the buyer is responsible for any loss in transit, and the Company has a legal right to payment for the spare parts. Management has determined that physical acceptance of the spare parts to be a formality in accordance with Accounting Standards Codification (“ASC”) 606-10-5-86. The spare parts transaction price is a fixed dollar amount and is stated on each purchase order for a fixed amount by total number of parts. Spare parts revenue is based on a set price for a set number of parts as defined in the purchase order. The performance obligation is completed once the parts have shipped and, as a result, all of the transaction price is allocated to that performance obligation. Management has determined that it is appropriate for the Company to recognize spare parts sales at a point in time (i.e., the date the parts are shipped) under ASC 606. Additionally, there is no impact to the timing and amounts of revenue recognized for spare parts sales related to the implementation of ASC 606 upon adoption on January 1, 2018. Equipment Sales Equipment sales represent the selective purchase and resale of commercial aircraft engines and other aircraft equipment. The Company and customer enter into an agreement which outlines the place and date of sale, purchase price, payment terms, condition of the asset, bill of sale, and the assignment of rights and warranties from the Company to the customer. Management has identified the promise in the equipment sale contract to be the transfer of ownership of the asset. Management believes the asset holds standalone value to the customer as it is not dependent on any other services for functionality purposes and therefore is distinct within the context of the contract and as described in ASC 606-10. As such, management has identified the transfer of the asset as the performance obligation. The transaction price is set at a fixed dollar amount per fixed quantity (number of assets) and is explicitly stated in each contract. Equipment sales revenue is based on a set price for a set number of assets, which is allocated to the performance obligation discussed above, in its entirety. The Company has determined the date of transfer to the customer to be the date the customer obtains control and title over the asset and the date which revenue is to be recognized and payment is due. Therefore, there is no impact to the timing and amounts of revenue recognized for equipment sales related to the implementation of ASC 606 upon adoption on January 1, 2018. Managed Services Managed services revenue predominantly represents fleet management and engine storage services which may be combined on a single contract with a customer. Fleet management services are performed for a stated fixed fee as agreed upon in the services agreement. Engine storage services are for a fixed monthly fee. For a contract containing more than one performance obligation, the allocation of the transaction price is generally performed on the basis of the relative stand-alone selling price of each distinct good or service in the contract. As each of the services provided within the contract have separate prices, the Company allocates the price to its related performance obligation described above. Management has determined each of the revenue elements contain performance obligations that are satisfied over time and therefore recognizes revenue over time in accordance with ASC 606-10-25-27. The Company utilizes the percentage-of-completion method (input method) for recognizing fleet management services and will calculate revenues based on labor hours incurred. Additionally, as is required by ASC 606-10-25-35, as circumstances change over time, the Company will update its measure of progress to reflect any changes in the outcome of the performance obligation. Engine storage services are recognized on a monthly basis utilizing the input method of days passed. Therefore, there is no impact to the timing and amounts of revenue recognized for managed services related to the implementation of ASC 606 upon adoption on January 1, 2018. Amounts owed for managed services are typically billed upon contract completion. At December 31, 2019, unbilled revenue was $0.8 million and the Company expects it to be fully recognized by June 30, 2020. Additionally, managed services are presented within the Other revenue line in the Consolidated Statements of Income. Other Revenue Other revenue consists primarily of management fee income, lease administration fees, third party consignment commissions earned, service fee revenue, interest revenue, and other discrete revenue items.
Equipment Held for Operating Lease	Equipment Held for Operating Lease Aircraft assets held for operating lease are stated at cost, less accumulated depreciation. Certain costs incurred in connection with the acquisition of aircraft assets are capitalized as part of the cost of such assets. Major overhauls paid for by the Company, which improve functionality or extend the original useful life, are capitalized and depreciated over the shorter of the estimated period to the next overhaul (“deferral method”) or the remaining useful life of the equipment. The Company does not accrue for planned major maintenance. The cost of overhauls of aircraft assets under long term leases, for which the lessee is responsible for maintenance during the period of the lease, are paid for by the lessee or from reimbursable maintenance reserves paid to the Company in accordance with the lease, and are not capitalized. Based on specific aspects of the equipment, the Company generally depreciates engines on a straight-line basis over a 15-year period from the acquisition date to a 55% residual value. This methodology is believed to accurately reflect the Company’s typical holding period for the engine assets and that the residual value assumption reasonably approximates the selling price of the assets 15 years from the date of acquisition. The typical 15 year holding period is the estimated useful life of the Company’s engines based on its business model and plans, and represents how long the Company anticipates holding a newly acquired engine. The technical useful life of a new engine can be in excess of 25 years. The Company reviews the useful life and residual values of all engines periodically as demand changes to accurately depreciate the cost of equipment over the useful life of the engines. The aircraft and airframes owned by the Company are depreciated on a straight-line basis over an estimated useful life of 13 to 20 years to a 15% to 17% residual value. The other leased parts and related equipment owned by the Company are depreciated on a straight-line basis over an estimated useful life of 14 to 15 years to a 25% residual value. The useful life of older generation engines and aircraft may be significantly less based upon the technical status of the engine, as well as supply and demand factors. For these older generation engines and aircraft, the remaining useful life and the remaining expected holding period are typically the same. For older generation engines or aircraft that are unlikely to be repaired at the end of the current expected useful lives, the Company depreciates the engines or aircraft over their estimated lives to a residual value based on an estimate of the wholesale value of the parts after disassembly. As of December 31, 2019, 47 engines having a net book value of $51.1 million were depreciated under this policy with estimated useful lives ranging from 1 to 79 months. The Company adjusts its estimates annually for these older generation assets, including updating estimates of an engine’s or aircraft’s remaining operating life as well as future residual value expected from part-out based on the current technical status of the engine or aircraft. The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Long-lived assets to be disposed are reported at the lower of carrying amount or fair value less cost to sell. Impairment is identified by review of appraisals or by comparison of undiscounted forecasted cash flows, including estimated sales proceeds, over the life of the asset with the assets’ book value. If the undiscounted forecasted cash flows are less than the book value, the asset is written down to its fair value. Fair value is determined per individual asset by reference to independent appraisals, quoted market prices (e.g. an offer to purchase) and other factors considered relevant by the Company. The Company conducts a formal annual review of the carrying value of long-lived assets and also evaluates assets during the year if a triggering event is identified indicating impairment is possible.
Equipment Held for Sale	Equipment Held for Sale Equipment held for sale includes engines being marketed for sale as well as third party consigned assets. The assets to be disposed are reported at the lower of carrying amount or fair value less costs to sell.
Debt Issuance Costs and Related Fees	Debt Issuance Costs and Related Fees Fees paid in order to secure debt are capitalized, included in Debt obligations on the Consolidated Balance Sheets, and amortized over the life of the related loan using the effective interest method.
Interest Rate Hedging	Interest Rate Hedging The Company enters into various derivative instruments periodically to mitigate the exposure on variable rate borrowings. The derivative instruments are fixed-rate interest swaps that are recorded at fair value as either an asset or liability. While substantially all of the Company’s derivative transactions are entered into for the purposes described above, hedge accounting is only applied where specific criteria have been met and it is practicable to do so. In order to apply hedge accounting, the transaction must be designated as a hedge and it must be highly effective. The hedging instrument’s effectiveness is assessed utilizing regression analysis at the inception of the hedge and on at least a quarterly basis throughout its life. All of the transactions that the Company has designated as hedges are cash flow hedges. The effective portion of the change in fair value on a derivative instrument designated as a cash flow hedge is reported as a component of other comprehensive income and is reclassified into earnings in the period during which the transaction being hedged affects earnings. The ineffective portion of the hedges is recorded in earnings in the current period.
Income Taxes	Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred income taxes are recognized for the tax consequences of “temporary differences” by applying enacted statutory tax rates applicable to future years to differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. The effect on deferred taxes of a change in the tax rates is recognized in income in the period that includes the enactment date. The Company recognizes in the financial statements the impact of a tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs (see Note 8). The Company files income tax returns in various states and countries which may have different statutes of limitations. The Company records penalties and accrued interest related to uncertain tax positions in income tax expense. Such adjustments have historically been minimal and immaterial to our financial results.
Property, Equipment and Furnishings	Property, Equipment and Furnishings Property, equipment and furnishings are recorded at cost and depreciated using the straight-line method over the estimated useful lives of the related assets, which range from three to thirty-nine years. Leasehold improvements are recorded at cost and depreciated by the straight-line method over the shorter of the lease term or useful life of the leasehold.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers highly liquid investments readily convertible into known amounts of cash, with original maturities of 90 days or less, as cash equivalents.
Restricted Cash	Restricted Cash The Company has certain bank accounts that are subject to restrictions in connection with its WEST II, WEST III and WEST IV borrowings and a note payable. Under these borrowings, cash is collected in restricted accounts, which are used to service the debt and any remaining amounts, after debt service and defined expenses, are distributed to the Company. Additionally, a portion of maintenance reserve payments and some or all of the lease security deposits are accumulated in restricted accounts and are available to fund future maintenance events and to secure lease payments, respectively. Under WEST II, cash from maintenance reserve payments is held in a restricted cash account equal to the maintenance obligations projected for the subsequent six months, and is subject to a minimum balance of $9.0 million. Under WEST III and WEST IV, cash from maintenance reserve payments is held in a restricted cash account equal to a portion of the maintenance obligations projected for the subsequent nine months, and is subject to a minimum balance of $10.0 million. Under WEST II, all security deposits are held in a restricted cash account until the end of the lease. Under WEST III and WEST IV, security deposits are held in a restricted cash account equal to a portion of the security deposits for leases scheduled to terminate over the subsequent four months, subject to a minimum balance of $1.0 million. Provided lease return conditions have been met, these deposits will be returned to the lessee. To the extent return conditions are not met, these deposits may be retained by the Company.
Spare Parts Inventory	Spare Parts Inventory Spare parts inventory consists of spare aircraft and engine parts purchased either directly by Willis Aero and also engines removed from the lease portfolio to be parted out. Spare parts inventory is stated at lower of cost or net realizable value. An impairment charge for excess or inactive inventory is recorded based upon an analysis that considers current inventory levels, historical usage patterns, future sales expectations and salvage value.
Intangible Assets	Intangible Assets Intangible assets include customer relationships and goodwill at Willis Asset Management. Intangible assets are accounted for in accordance with ASC 350, “Intangibles — Goodwill and Other.” Customer relationships are amortized on a straight line basis over their estimated useful life of five years. The Company has no intangible assets with indefinite useful lives. Goodwill is assessed for impairment annually.
Other assets	Other assets Other assets typically include prepaid purchase deposits and other prepaid expenses. As of December 31, 2019 and 2018, other assets included prepaid deposits of $10.6 million and $1.9 million, respectively, relating to commitments to purchase equipment.
Management Estimates	Management Estimates These financial statements have been prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States. The preparation of consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. Management evaluates estimates on an ongoing basis, including those related to residual values, estimated asset lives, impairments and bad debts. Estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Management believes that the accounting policies on revenue recognition, maintenance reserves and expenditures, useful life of equipment, asset residual values, asset impairment and allowance for doubtful accounts are critical to the results of operations. If the useful lives or residual values are lower than those estimated, upon sale of the asset a loss may be realized. Significant management judgment is required in the forecasting of future operating results, which are used in the preparation of projected undiscounted cash-flows and should different conditions prevail, material impairment write-downs may occur.
Earnings per share information	Earnings per share information Basic earnings per common share is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted earnings per common share is computed by dividing net income by the weighted average number of shares outstanding, adjusted for the dilutive effect of unvested restricted stock awards (“RSAs”). See Note 10 for more information on the computation of earnings per share.
Investments	Investments The Company’s investments are joint ventures, where it owns 50% of the equity of the ventures and are accounted for using the equity method of accounting. The investments are recorded at the amount invested plus or minus our 50% share of net income or loss, less any distributions or return of capital received from the entities.
Stock Based Compensation	Stock Based Compensation The Company recognizes stock based compensation expense in the financial statements for share-based awards based on the grant-date fair value of those awards. Stock based compensation expense is recognized over the requisite service periods of the awards on a straight-line basis, which is generally commensurate with the vesting term. Forfeitures are accounted for as they occur.
Initial Direct Costs associated with Leases	Initial Direct Costs associated with LeasesThe Company accounts for the initial direct costs, including sales commissions and legal fees, incurred in obtaining a new lease by deferring and amortizing those costs over the term of the lease. The amortization of these costs is recorded under general and administrative expenses in the Consolidated Statements of Income.
Maintenance Rights	Maintenance Rights The Company identifies, measures and accounts for maintenance right assets and liabilities associated with acquisitions of equipment with in-place leases. A maintenance right asset represents the fair value of the contractual right under a lease to receive equipment in an improved maintenance condition as compared to the maintenance condition on the acquisition date. A maintenance right liability represents the Company's obligation to pay the lessee for the difference between the lease-end contractual maintenance condition of the equipment and the actual maintenance condition of the equipment on the acquisition date. The equipment condition at the end of the lease term may result in either overhaul work being performed by the lessee to meet the required return condition or a financial settlement. When a capital event is performed on the equipment by the lessee, which satisfies their maintenance right obligation, the maintenance rights are added to the equipment basis and depreciated to the next capital event. When equipment is sold before the end of the pre-existing lease, the maintenance rights are applied against any accumulated maintenance reserves, if paid by the lessee, and the remaining balance is applied to the disposition gain or loss. When a lease terminates, an end of lease true-up is performed and the maintenance right is applied against the accumulated maintenance reserves or, for non-reserve lessees the final settlement payment, and any remaining net maintenance right is recorded in the income statement.
Foreign Currency Translation	Foreign Currency Translation The Company’s foreign investments have been converted at rates of exchange in effect at the balance sheet dates. The changes in exchange rates in our foreign investments reported under the equity method are included in stockholders’ equity as accumulated other comprehensive income.
Risk Concentrations	Risk Concentrations Financial instruments which potentially subject us to concentrations of credit risk consist principally of cash deposits, lease receivables and interest rate swaps. The Company places its cash deposits with financial institutions and other credit-worthy institutions, such as money market funds, and limits the amount of credit exposure to any one party. Management opts for security of principal as opposed to yield. Concentrations of credit risk with respect to lease receivables are limited due to the large number of customers comprising the customer base, and their dispersion across different geographic areas. Some lessees are required to make payments for maintenance reserves at the end of the lease however, this risk is considered limited due to the relatively few lessees which have this provision in the lease. The Company enters into interest rate swap agreements with counterparties that are investment grade financial institutions.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recent Accounting Pronouncements Adopted by the Company In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842)” (“ASU 2016-02”) that amends the accounting guidance on leases for both lessees and lessors. The new standard establishes a right-of-use (“ROU”) model that requires a lessee to record an ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The FASB also subsequently issued amendments to the standard, including providing an additional and optional transition method to adopt the new standard, as well as certain practical expedients related to land easements and lessor accounting. The accounting standard update originally required the use of a modified retrospective approach reflecting the application of the standard to leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements with the option to elect certain practical expedients. A subsequent amendment to the standard provided an additional and optional transition method that allowed entities to initially apply the new leases standard at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. Consequently, an entity’s reporting for the comparative periods presented in the financial statements in which it adopted the new leases standard would continue to be in accordance with ASC Topic 840 if the optional transition method is elected. The Company adopted the standard using the optional transition method with no restatement of comparative periods and a cumulative effect adjustment recognized as of the date of adoption. Adoption of the new standard resulted in the recording of ROU assets and lease liabilities of approximately $4.5 million and $4.3 million, respectively, as of January 1, 2019. The cumulative effect adjustment to retained earnings as of January 1, 2019 was $0.2 million. The standard did not materially impact our consolidated financial statements. As part of the implementation process, the Company assessed its lease arrangements and evaluated practical expedients and accounting policy elections to meet the reporting requirements of this standard. The Company also evaluated the changes in controls and processes that were necessary to implement the new standard, and no material changes were required. The Company elected the ‘package of practical expedients’ which permitted us not to reassess under the new standard the prior conclusions about lease identification, lease classification, and initial direct costs. The Company did not elect the use-of-hindsight or the practical expedient pertaining to land easements; the latter not being applicable to WLFC. Under ASC 842, a lease is a sales-type lease if any one of five criteria are met, each of which indicate that the lease, in effect, transfers control of the underlying asset to the lessee. If none of those five criteria are met, but two additional criteria are both met, indicating that the lessor has transferred substantially all the risks and benefits of the underlying asset to the lessee, the lease is a direct financing lease. All leases that are not sales-type or direct financing leases are operating leases. Furthermore, the Company will assess on an ongoing basis, the updated guidance provided for sale leaseback transactions and whether failed sale leaseback accounting treatment is triggered. As lessor, the Company's leases in place upon adoption of ASC 842 remained as operating leases under the new standard. In addition, due to the new standard’s narrowed definition of initial direct costs, the Company expenses as incurred, certain lease origination costs that were previously capitalized as initial direct costs and amortized to expense over the lease term. The new standard also provides practical expedients for an entity’s ongoing accounting. The Company elected the short-term lease recognition exemption for all leases that qualify. As a result, for those leases that qualify, the Company did not recognize ROU assets or lease liabilities, including for existing short-term leases. The Company also elected the practical expedient to not separate lease and non-lease components for the majority of its leases as both lessee and lessor. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” The ASU is targeted at simplifying the application of hedge accounting and aims at aligning the recognition and presentation of the effects of hedge instruments and hedge items. This guidance became effective for the Company on January 1, 2019 and it did not result in an adjustment to the opening balance of retained earnings for the Company's existing cash flow hedge. Additionally, the presentation and disclosure aspect of ASU 2017-12 was applied on a prospective basis within Note 7. In June 2018, the FASB issued ASU 2018-07, “Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Payment Accounting.” The ASU expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from non-employees. The Company adopted this guidance effective January 1, 2019 and it did not materially impact our consolidated financial statements. In July 2019, the FASB issued ASU 2019-07, “Codification Updates to SEC Sections - Amendments to SEC Paragraphs Pursuant to SEC Final Rule Releases No. 33-10532, Disclosure Update and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization and Miscellaneous Updates (SEC Update).” The ASU clarifies or improves the disclosure and presentation requirements of a variety of codification topics by aligning them with the SEC's regulations, thereby eliminating redundancies and making the codification easier to apply. This ASU was effective upon issuance and it did not materially impact our consolidated financial statements. Recent Accounting Pronouncements To Be Adopted by the Company In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses of Financial Instruments” (“ASU 2016-13”). ASU 2016-13 revises the measurement of credit losses for financial assets measured at amortized cost from an incurred loss methodology to an expected loss methodology. ASU 2016-13 affects trade receivables, debt securities, net investments in leases, and most other financial assets that represent a right to receive cash. Additional disclosures about significant estimates and credit quality are also required. In November 2018, the FASB issued ASU 2018-19, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses.” This ASU clarifies receivables from operating leases are accounted for using the lease guidance and not as financial instruments. In April 2019, the FASB issued ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments.” This ASU clarifies various scoping and other issues arising from ASU 2016-13. In May 2019, the FASB issued ASU 2019-05, “Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief.” This ASU provides targeted transition relief allowing for an irrevocable one-time election upon adoption of the new standard to measure financial assets previously measured at amortized cost using the fair value option. In November 2019, the FASB issued ASU 2019-10 “Financial Instruments - Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates” and ASU 2019-11, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses.” ASU 2019-10 amends effective dates for public business entities not meeting the definition of an SEC filer. ASU 2019-11 clarifies and addresses stakeholders’ specific issues around certain aspects of the amendments in ASU 2016-13. The amendments in this ASU are effective for the Company on January 1, 2020, with early adoption permitted. The Company will adopt this accounting standard update effective January 1, 2020. While the Company continues to evaluate certain aspects of the new standard, including those still being revised by the FASB, the Company does not expect the new standard will have a material effect on its financial statements, but it does expect significant new disclosures and controls in order to comply with the new standard requirements. In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes” (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. ASU 2019-12 also improves consistent application of and simplifies Generally Accepted Accounting Principles (“GAAP”) for other areas of Topic 740 by clarifying and amending existing guidance. This ASU is effective for interim and annual periods beginning after December 15, 2020, with early adoption permitted. The Company plans to adopt this guidance effective January 1, 2021 and is currently evaluating the potential impact adoption will have on the consolidated financial statements and related disclosures.

Organization and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Willis Lease Finance Corporation with its subsidiaries is a provider of aviation services whose primary focus is providing operating leases of commercial aircraft, aircraft engines and other aircraft-related equipment to air carriers, manufacturers and overhaul/repair facilities worldwide. The Company also engages in the selective purchase and resale of commercial aircraft engines.

Willis Aeronautical Services, Inc. (“Willis Aero”) is a wholly-owned subsidiary whose primary focus is the sale of aircraft engine parts and materials through the acquisition or consignment of aircraft and engines.

Willis Asset Management Limited (“Willis Asset Management”) is a wholly-owned subsidiary whose primary focus is the engine management and consulting business.

Willis Engine Securitization Trust II (“WEST II” or the “WEST II Notes”) is a bankruptcy remote special purpose vehicle which was established for the purpose of financing aircraft engines through an asset-backed securitization (“ABS”), of which the Company is the sole beneficiary. WEST II is a variable interest entity (“VIE”) which the Company owns 100% of the interest and consolidates in its financial statements.

In August 2017, the Company closed on Willis Engine Securitization Trust III (“WEST III” or the “WEST III Notes”), a bankruptcy remote special purpose vehicle, which was established for the purpose of financing aircraft engines through an ABS, of which the Company is the sole beneficiary. The WEST III Notes were issued in two series, with the Series A Notes issued in an aggregate principal amount of $293.7 million and the Series B Notes in an aggregate principal amount of $42.0 million. The Company used these funds, net of transaction expenses, to pay off part of its revolving credit facility. WEST III is a VIE which the Company owns 100% of the interest and consolidates in its financial statements.

In August 2018, the Company closed on Willis Engine Securitization Trust IV (“WEST IV” or the “WEST IV Notes”), a bankruptcy remote special purpose vehicle, which was established for the purpose of financing aircraft engines through an ABS, of which the Company is the sole beneficiary. The WEST IV Notes were issued in two series, with the Series A Notes issued in an aggregate principal amount of $326.8 million and the Series B Notes in an aggregate principal amount of $46.7 million. WEST IV is a VIE which the Company owns 100% of the interest and consolidates in its financial statements.

Principal and interest on the WEST II, III and IV Notes are payable monthly to the extent of available cash in accordance with a priority of payments included in the respective indenture agreements.

The WEST II, III and IV Notes are secured by, among other things, the respective ABS’s direct and indirect interests in a portfolio of assets. The WEST II, WEST III and WEST IV Notes have scheduled amortizations and are payable solely from revenue received from the engines and the engine leases, after payment of certain expenses of the respective ABS. The assets of WEST II, WEST III and WEST IV are not available to satisfy the Company’s obligations other than the obligations specific to the respective ABS. WEST II, WEST III and WEST IV are consolidated for financial statement presentation purposes, with the respective assets and liabilities on the Company's balance sheet. The ABS’ ability to make distributions and pay dividends to the Company is subject to the prior payments of its debt and other obligations and maintenance of adequate reserves and capital. Under each ABS, cash is collected in a restricted account, which is used to service the debt and any remaining amounts, after debt service and defined expenses, are distributed to the Company. Additionally, a portion of the maintenance reserve payments and lease security deposits are formulaically accumulated in restricted accounts and are available to fund future maintenance events and to secure lease payments, respectively.

Additionally, in connection with WEST II, WEST III and WEST IV, the Company entered into servicing agreements and administrative agency agreements to provide certain engine, lease management and reporting functions in return for fees based on a percentage of collected lease revenues and asset sales. Because WEST II, WEST III and WEST IV are consolidated for financial statement reporting purposes, all fees eliminate upon consolidation.

Basis of Presentation and Principles of Consolidation

The accompanying consolidated financial statements include the accounts of WLFC and its wholly owned subsidiaries, including VIEs where the Company is the primary beneficiary, in accordance with consolidation guidance. The Company evaluates all entities in

which it has an economic interest firstly to determine whether for accounting purposes the entity is a variable interest entity or voting interest entity. If the entity is a variable interest entity the Company consolidates the financial statements of that entity if it is the primary beneficiary of the entities’ activities. If the entity is a voting interest entity the Company consolidates the entity when it has a majority of voting interests. Intercompany transactions and balances have been eliminated in consolidation.

The condensed parent company financial statements should be read in conjunction with the Company’s consolidated financial statements and the accompanying notes herein.

Revenue Recognition

Leasing revenue

Revenue from leasing of engines, aircraft and related parts and equipment is recognized as operating lease revenue on a straight-line basis over the terms of the applicable lease agreements. Revenue is not recognized when cash collection is not reasonably assured. When collectability is not reasonably assured, the customer is placed on non-accrual status and revenue is recognized when cash payments are received.

Under the terms of some of the Company’s leases, the lessees pay use fees (also known as maintenance reserves) to the Company based on usage of the leased asset, which are designed to cover expected future maintenance costs. Some of these amounts are reimbursable to the lessee if they make specifically defined maintenance expenditures. Use fees received are recognized in revenue as maintenance reserve revenue if they are not reimbursable to the lessee. Use fees that are reimbursable are recorded as a maintenance reserve liability until they are reimbursed to the lessee, the lease terminates, or the obligation to reimburse the lessee for such reserves ceases to exist, at which time they are recognized in revenue as maintenance reserve revenue.

Certain lessees may be significantly delinquent in their rental payments and may default on their lease obligations. As of December 31, 2019, the Company had an aggregate of approximately $2.7 million in lease rent and $3.8 million in maintenance reserve receivables more than 30 days past due. Inability to collect receivables or to repossess engines or other leased equipment in the event of a default by a lessee could have a material adverse effect on the Company. The Company estimates an allowance for doubtful accounts for receivables it does not consider fully collectible. The allowance for doubtful accounts includes the following: (1) specific reserves for receivables which are impaired for which management believes full collection is doubtful; and (2) a general reserve for estimated losses based on historical experience.

No customer accounted for greater than 10% of total lease rent revenue in 2019 and 2018.

Gain on sale of leased equipment

The Company regularly sells equipment from its lease portfolio. This equipment may or may not be subject to a lease at the time of sale. The net gain or loss on such sales is recognized as revenue and consists of proceeds associated with the sale less the net book value of the asset sold and any direct costs associated with the sale. To the extent that deposits associated with the equipment are not included in the sale, any such amount is included in the calculation of gain or loss.

Spare parts sales

The Spare Parts Sales reportable segment primarily engages in the sale of aircraft engine parts and materials through the acquisition or consignment of engines from third parties or the Company’s leasing operations. The parts are sold at a fixed price with no right of return. In determining the performance obligation, management has identified the promise in the contract to be the shipment of the spare parts to the customer. Title passes to the buyer when the goods are shipped, and the buyer is responsible for any loss in transit, and the Company has a legal right to payment for the spare parts. Management has determined that physical acceptance of the spare parts to be a formality in accordance with Accounting Standards Codification (“ASC”) 606-10-5-86.

The spare parts transaction price is a fixed dollar amount and is stated on each purchase order for a fixed amount by total number of parts. Spare parts revenue is based on a set price for a set number of parts as defined in the purchase order. The performance obligation is completed once the parts have shipped and, as a result, all of the transaction price is allocated to that performance obligation. Management has determined that it is appropriate for the Company to recognize spare parts sales at a point in time (i.e., the date the parts are shipped) under ASC 606. Additionally, there is no impact to the timing and amounts of revenue recognized for spare parts sales related to the implementation of ASC 606 upon adoption on January 1, 2018.

Equipment Sales

Equipment sales represent the selective purchase and resale of commercial aircraft engines and other aircraft equipment. The Company and customer enter into an agreement which outlines the place and date of sale, purchase price, payment terms, condition of the asset, bill of sale, and the assignment of rights and warranties from the Company to the customer. Management has identified the promise in

the equipment sale contract to be the transfer of ownership of the asset. Management believes the asset holds standalone value to the customer as it is not dependent on any other services for functionality purposes and therefore is distinct within the context of the contract and as described in ASC 606-10. As such, management has identified the transfer of the asset as the performance obligation. The transaction price is set at a fixed dollar amount per fixed quantity (number of assets) and is explicitly stated in each contract. Equipment sales revenue is based on a set price for a set number of assets, which is allocated to the performance obligation discussed above, in its entirety. The Company has determined the date of transfer to the customer to be the date the customer obtains control and title over the asset and the date which revenue is to be recognized and payment is due. Therefore, there is no impact to the timing and amounts of revenue recognized for equipment sales related to the implementation of ASC 606 upon adoption on January 1, 2018.

Managed Services

Managed services revenue predominantly represents fleet management and engine storage services which may be combined on a single contract with a customer. Fleet management services are performed for a stated fixed fee as agreed upon in the services agreement. Engine storage services are for a fixed monthly fee. For a contract containing more than one performance obligation, the allocation of the transaction price is generally performed on the basis of the relative stand-alone selling price of each distinct good or service in the contract. As each of the services provided within the contract have separate prices, the Company allocates the price to its related performance obligation described above. Management has determined each of the revenue elements contain performance obligations that are satisfied over time and therefore recognizes revenue over time in accordance with ASC 606-10-25-27. The Company utilizes the percentage-of-completion method (input method) for recognizing fleet management services and will calculate revenues based on labor hours incurred. Additionally, as is required by ASC 606-10-25-35, as circumstances change over time, the Company will update its measure of progress to reflect any changes in the outcome of the performance obligation. Engine storage services are recognized on a monthly basis utilizing the input method of days passed. Therefore, there is no impact to the timing and amounts of revenue recognized for managed services related to the implementation of ASC 606 upon adoption on January 1, 2018.

Amounts owed for managed services are typically billed upon contract completion. At December 31, 2019, unbilled revenue was $0.8 million and the Company expects it to be fully recognized by June 30, 2020. Additionally, managed services are presented within the Other revenue line in the Consolidated Statements of Income.

Other Revenue

Other revenue consists primarily of management fee income, lease administration fees, third party consignment commissions earned, service fee revenue, interest revenue, and other discrete revenue items.

Equipment Held for Operating Lease

Aircraft assets held for operating lease are stated at cost, less accumulated depreciation. Certain costs incurred in connection with the acquisition of aircraft assets are capitalized as part of the cost of such assets. Major overhauls paid for by the Company, which improve functionality or extend the original useful life, are capitalized and depreciated over the shorter of the estimated period to the next overhaul (“deferral method”) or the remaining useful life of the equipment. The Company does not accrue for planned major maintenance. The cost of overhauls of aircraft assets under long term leases, for which the lessee is responsible for maintenance during the period of the lease, are paid for by the lessee or from reimbursable maintenance reserves paid to the Company in accordance with the lease, and are not capitalized.

Based on specific aspects of the equipment, the Company generally depreciates engines on a straight-line basis over a 15-year period from the acquisition date to a 55% residual value. This methodology is believed to accurately reflect the Company’s typical holding period for the engine assets and that the residual value assumption reasonably approximates the selling price of the assets 15 years from the date of acquisition. The typical 15 year holding period is the estimated useful life of the Company’s engines based on its business model and plans, and represents how long the Company anticipates holding a newly acquired engine. The technical useful life of a new engine can be in excess of 25 years. The Company reviews the useful life and residual values of all engines periodically as demand changes to accurately depreciate the cost of equipment over the useful life of the engines.

The aircraft and airframes owned by the Company are depreciated on a straight-line basis over an estimated useful life of 13 to 20 years to a 15% to 17% residual value. The other leased parts and related equipment owned by the Company are depreciated on a straight-line basis over an estimated useful life of 14 to 15 years to a 25% residual value.

The useful life of older generation engines and aircraft may be significantly less based upon the technical status of the engine, as well as supply and demand factors. For these older generation engines and aircraft, the remaining useful life and the remaining expected holding period are typically the same. For older generation engines or aircraft that are unlikely to be repaired at the end of the current expected useful lives, the Company depreciates the engines or aircraft over their estimated lives to a residual value based on an estimate of the wholesale value of the parts after disassembly. As of December 31, 2019, 47 engines having a net book value of $51.1 million were depreciated under this policy with estimated useful lives ranging from 1 to 79 months. The Company adjusts its estimates annually

for these older generation assets, including updating estimates of an engine’s or aircraft’s remaining operating life as well as future residual value expected from part-out based on the current technical status of the engine or aircraft.

The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Long-lived assets to be disposed are reported at the lower of carrying amount or fair value less cost to sell. Impairment is identified by review of appraisals or by comparison of undiscounted forecasted cash flows, including estimated sales proceeds, over the life of the asset with the assets’ book value. If the undiscounted forecasted cash flows are less than the book value, the asset is written down to its fair value. Fair value is determined per individual asset by reference to independent appraisals, quoted market prices (e.g. an offer to purchase) and other factors considered relevant by the Company. The Company conducts a formal annual review of the carrying value of long-lived assets and also evaluates assets during the year if a triggering event is identified indicating impairment is possible.

Equipment Held for Sale

Equipment held for sale includes engines being marketed for sale as well as third party consigned assets. The assets to be disposed are reported at the lower of carrying amount or fair value less costs to sell.

Debt Issuance Costs and Related Fees

Fees paid in order to secure debt are capitalized, included in Debt obligations on the Consolidated Balance Sheets, and amortized over the life of the related loan using the effective interest method.

Interest Rate Hedging

The Company enters into various derivative instruments periodically to mitigate the exposure on variable rate borrowings. The derivative instruments are fixed-rate interest swaps that are recorded at fair value as either an asset or liability.

While substantially all of the Company’s derivative transactions are entered into for the purposes described above, hedge accounting is only applied where specific criteria have been met and it is practicable to do so. In order to apply hedge accounting, the transaction must be designated as a hedge and it must be highly effective. The hedging instrument’s effectiveness is assessed utilizing regression analysis at the inception of the hedge and on at least a quarterly basis throughout its life. All of the transactions that the Company has designated as hedges are cash flow hedges. The effective portion of the change in fair value on a derivative instrument designated as a cash flow hedge is reported as a component of other comprehensive income and is reclassified into earnings in the period during which the transaction being hedged affects earnings. The ineffective portion of the hedges is recorded in earnings in the current period.

Income Taxes

The Company uses the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred income taxes are recognized for the tax consequences of “temporary differences” by applying enacted statutory tax rates applicable to future years to differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. The effect on deferred taxes of a change in the tax rates is recognized in income in the period that includes the enactment date.

The Company recognizes in the financial statements the impact of a tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs (see Note 8).

The Company files income tax returns in various states and countries which may have different statutes of limitations. The Company records penalties and accrued interest related to uncertain tax positions in income tax expense. Such adjustments have historically been minimal and immaterial to our financial results.

Property, Equipment and Furnishings

Property, equipment and furnishings are recorded at cost and depreciated using the straight-line method over the estimated useful lives of the related assets, which range from three to thirty-nine years. Leasehold improvements are recorded at cost and depreciated by the straight-line method over the shorter of the lease term or useful life of the leasehold.

Cash and Cash Equivalents

The Company considers highly liquid investments readily convertible into known amounts of cash, with original maturities of 90 days or less, as cash equivalents.

Restricted Cash

The Company has certain bank accounts that are subject to restrictions in connection with its WEST II, WEST III and WEST IV borrowings and a note payable. Under these borrowings, cash is collected in restricted accounts, which are used to service the debt and any remaining amounts, after debt service and defined expenses, are distributed to the Company. Additionally, a portion of maintenance reserve payments and some or all of the lease security deposits are accumulated in restricted accounts and are available to fund future maintenance events and to secure lease payments, respectively. Under WEST II, cash from maintenance reserve payments is held in a restricted cash account equal to the maintenance obligations projected for the subsequent six months, and is subject to a minimum balance of $9.0 million. Under WEST III and WEST IV, cash from maintenance reserve payments is held in a restricted cash account equal to a portion of the maintenance obligations projected for the subsequent nine months, and is subject to a minimum balance of $10.0 million. Under WEST II, all security deposits are held in a restricted cash account until the end of the lease. Under WEST III and WEST IV, security deposits are held in a restricted cash account equal to a portion of the security deposits for leases scheduled to terminate over the subsequent four months, subject to a minimum balance of $1.0 million. Provided lease return conditions have been met, these deposits will be returned to the lessee. To the extent return conditions are not met, these deposits may be retained by the Company.

Spare Parts Inventory

Spare parts inventory consists of spare aircraft and engine parts purchased either directly by Willis Aero and also engines removed from the lease portfolio to be parted out. Spare parts inventory is stated at lower of cost or net realizable value. An impairment charge for excess or inactive inventory is recorded based upon an analysis that considers current inventory levels, historical usage patterns, future sales expectations and salvage value.

Intangible Assets

Intangible assets include customer relationships and goodwill at Willis Asset Management. Intangible assets are accounted for in accordance with ASC 350, “Intangibles — Goodwill and Other.”

Customer relationships are amortized on a straight line basis over their estimated useful life of five years. The Company has no intangible assets with indefinite useful lives. Goodwill is assessed for impairment annually.

Other assets

Other assets typically include prepaid purchase deposits and other prepaid expenses. As of December 31, 2019 and 2018, other assets included prepaid deposits of $10.6 million and $1.9 million, respectively, relating to commitments to purchase equipment.

Management Estimates

These financial statements have been prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States.

The preparation of consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. Management evaluates estimates on an ongoing basis, including those related to residual values, estimated asset lives, impairments and bad debts. Estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

Management believes that the accounting policies on revenue recognition, maintenance reserves and expenditures, useful life of equipment, asset residual values, asset impairment and allowance for doubtful accounts are critical to the results of operations.

If the useful lives or residual values are lower than those estimated, upon sale of the asset a loss may be realized. Significant management judgment is required in the forecasting of future operating results, which are used in the preparation of projected undiscounted cash-flows and should different conditions prevail, material impairment write-downs may occur.

Earnings per share information

Basic earnings per common share is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted earnings per common share is computed by dividing net income by the weighted average number of shares

outstanding, adjusted for the dilutive effect of unvested restricted stock awards (“RSAs”). See Note 10 for more information on the computation of earnings per share.

Investments

The Company’s investments are joint ventures, where it owns 50% of the equity of the ventures and are accounted for using the equity method of accounting. The investments are recorded at the amount invested plus or minus our 50% share of net income or loss, less any distributions or return of capital received from the entities.

Stock Based Compensation

The Company recognizes stock based compensation expense in the financial statements for share-based awards based on the grant-date fair value of those awards. Stock based compensation expense is recognized over the requisite service periods of the awards on a straight-line basis, which is generally commensurate with the vesting term. Forfeitures are accounted for as they occur.

Initial Direct Costs associated with Leases

Initial Direct Costs associated with LeasesThe Company accounts for the initial direct costs, including sales commissions and legal fees, incurred in obtaining a new lease by deferring and amortizing those costs over the term of the lease. The amortization of these costs is recorded under general and administrative expenses in the Consolidated Statements of Income.

Maintenance Rights

The Company identifies, measures and accounts for maintenance right assets and liabilities associated with acquisitions of equipment with in-place leases. A maintenance right asset represents the fair value of the contractual right under a lease to receive equipment in an improved maintenance condition as compared to the maintenance condition on the acquisition date. A maintenance right liability represents the Company's obligation to pay the lessee for the difference between the lease-end contractual maintenance condition of the equipment and the actual maintenance condition of the equipment on the acquisition date. The equipment condition at the end of the lease term may result in either overhaul work being performed by the lessee to meet the required return condition or a financial settlement.

When a capital event is performed on the equipment by the lessee, which satisfies their maintenance right obligation, the maintenance rights are added to the equipment basis and depreciated to the next capital event. When equipment is sold before the end of the pre-existing lease, the maintenance rights are applied against any accumulated maintenance reserves, if paid by the lessee, and the remaining balance is applied to the disposition gain or loss. When a lease terminates, an end of lease true-up is performed and the maintenance right is applied against the accumulated maintenance reserves or, for non-reserve lessees the final settlement payment, and any remaining net maintenance right is recorded in the income statement.

Foreign Currency Translation

The Company’s foreign investments have been converted at rates of exchange in effect at the balance sheet dates. The changes in exchange rates in our foreign investments reported under the equity method are included in stockholders’ equity as accumulated other comprehensive income.

Risk Concentrations

Financial instruments which potentially subject us to concentrations of credit risk consist principally of cash deposits, lease receivables and interest rate swaps.

The Company places its cash deposits with financial institutions and other credit-worthy institutions, such as money market funds, and limits the amount of credit exposure to any one party. Management opts for security of principal as opposed to yield. Concentrations of credit risk with respect to lease receivables are limited due to the large number of customers comprising the customer base, and their dispersion across different geographic areas. Some lessees are required to make payments for maintenance reserves at the end of the lease however, this risk is considered limited due to the relatively few lessees which have this provision in the lease. The Company enters into interest rate swap agreements with counterparties that are investment grade financial institutions.

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted by the Company

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842)” (“ASU 2016-02”) that amends the accounting guidance on leases for both lessees and lessors. The new standard

establishes a right-of-use (“ROU”) model that requires a lessee to record an ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The FASB also subsequently issued amendments to the standard, including providing an additional and optional transition method to adopt the new standard, as well as certain practical expedients related to land easements and lessor accounting.

The accounting standard update originally required the use of a modified retrospective approach reflecting the application of the standard to leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements with the option to elect certain practical expedients. A subsequent amendment to the standard provided an additional and optional transition method that allowed entities to initially apply the new leases standard at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. Consequently, an entity’s reporting for the comparative periods presented in the financial statements in which it adopted the new leases standard would continue to be in accordance with ASC Topic 840 if the optional transition method is elected. The Company adopted the standard using the optional transition method with no restatement of comparative periods and a cumulative effect adjustment recognized as of the date of adoption.

Adoption of the new standard resulted in the recording of ROU assets and lease liabilities of approximately $4.5 million and $4.3 million, respectively, as of January 1, 2019. The cumulative effect adjustment to retained earnings as of January 1, 2019 was $0.2 million. The standard did not materially impact our consolidated financial statements.

As part of the implementation process, the Company assessed its lease arrangements and evaluated practical expedients and accounting policy elections to meet the reporting requirements of this standard. The Company also evaluated the changes in controls and processes that were necessary to implement the new standard, and no material changes were required. The Company elected the ‘package of practical expedients’ which permitted us not to reassess under the new standard the prior conclusions about lease identification, lease classification, and initial direct costs. The Company did not elect the use-of-hindsight or the practical expedient pertaining to land easements; the latter not being applicable to WLFC.

Under ASC 842, a lease is a sales-type lease if any one of five criteria are met, each of which indicate that the lease, in effect, transfers control of the underlying asset to the lessee. If none of those five criteria are met, but two additional criteria are both met, indicating that the lessor has transferred substantially all the risks and benefits of the underlying asset to the lessee, the lease is a direct financing lease. All leases that are not sales-type or direct financing leases are operating leases. Furthermore, the Company will assess on an ongoing basis, the updated guidance provided for sale leaseback transactions and whether failed sale leaseback accounting treatment is triggered. As lessor, the Company's leases in place upon adoption of ASC 842 remained as operating leases under the new standard. In addition, due to the new standard’s narrowed definition of initial direct costs, the Company expenses as incurred, certain lease origination costs that were previously capitalized as initial direct costs and amortized to expense over the lease term.

The new standard also provides practical expedients for an entity’s ongoing accounting. The Company elected the short-term lease recognition exemption for all leases that qualify. As a result, for those leases that qualify, the Company did not recognize ROU assets or lease liabilities, including for existing short-term leases. The Company also elected the practical expedient to not separate lease and non-lease components for the majority of its leases as both lessee and lessor.

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” The ASU is targeted at simplifying the application of hedge accounting and aims at aligning the recognition and presentation of the effects of hedge instruments and hedge items. This guidance became effective for the Company on January 1, 2019 and it did not result in an adjustment to the opening balance of retained earnings for the Company's existing cash flow hedge. Additionally, the presentation and disclosure aspect of ASU 2017-12 was applied on a prospective basis within Note 7.

In June 2018, the FASB issued ASU 2018-07, “Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Payment Accounting.” The ASU expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from non-employees. The Company adopted this guidance effective January 1, 2019 and it did not materially impact our consolidated financial statements.

In July 2019, the FASB issued ASU 2019-07, “Codification Updates to SEC Sections - Amendments to SEC Paragraphs Pursuant to SEC Final Rule Releases No. 33-10532, Disclosure Update and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization and Miscellaneous Updates (SEC Update).” The ASU clarifies or improves the disclosure and presentation requirements of a variety of codification topics by aligning them with the SEC's regulations, thereby eliminating redundancies and making the codification easier to apply. This ASU was effective upon issuance and it did not materially impact our consolidated financial statements.

Recent Accounting Pronouncements To Be Adopted by the Company

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses of Financial Instruments” (“ASU 2016-13”). ASU 2016-13 revises the measurement of credit losses for financial assets measured at amortized cost from an incurred loss methodology to an expected loss methodology. ASU 2016-13 affects trade receivables, debt securities, net investments in leases, and most other financial assets that represent a right to receive cash. Additional disclosures about significant estimates and credit quality are also required. In November 2018, the FASB issued ASU 2018-19, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses.” This ASU clarifies receivables from operating leases are accounted for using the lease guidance and not as financial instruments. In April 2019, the FASB issued ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments.” This ASU clarifies various scoping and other issues arising from ASU 2016-13. In May 2019, the FASB issued ASU 2019-05, “Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief.” This ASU provides targeted transition relief allowing for an irrevocable one-time election upon adoption of the new standard to measure financial assets previously measured at amortized cost using the fair value option. In November 2019, the FASB issued ASU 2019-10 “Financial Instruments - Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates” and ASU 2019-11, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses.” ASU 2019-10 amends effective dates for public business entities not meeting the definition of an SEC filer. ASU 2019-11 clarifies and addresses stakeholders’ specific issues around certain aspects of the amendments in ASU 2016-13. The amendments in this ASU are effective for the Company on January 1, 2020, with early adoption permitted. The Company will adopt this accounting standard update effective January 1, 2020.

While the Company continues to evaluate certain aspects of the new standard, including those still being revised by the FASB, the Company does not expect the new standard will have a material effect on its financial statements, but it does expect significant new disclosures and controls in order to comply with the new standard requirements.

In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes” (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. ASU 2019-12 also improves consistent application of and simplifies Generally Accepted Accounting Principles (“GAAP”) for other areas of Topic 740 by clarifying and amending existing guidance. This ASU is effective for interim and annual periods beginning after December 15, 2020, with early adoption permitted. The Company plans to adopt this guidance effective January 1, 2021 and is currently evaluating the potential impact adoption will have on the consolidated financial statements and related disclosures.