IDEXX Laboratories (IDXX) 10-K 22 Feb 24 2023 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 12, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	0-19271
Entity Registrant Name	IDEXX LABORATORIES INC /DE
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	01-0393723
Entity Address, Address Line One	One IDEXX Drive
Entity Address, City or Town	Westbrook,
Entity Address, State or Province	ME
Entity Address, Postal Zip Code	04092
City Area Code	207
Local Phone Number	556-0300
Title of 12(b) Security	Common Stock, $0.10 par value per share
Trading Symbol	IDXX
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 41,325,387,624
Entity Common Stock, Shares Outstanding (in shares)		83,089,381
Documents Incorporated by Reference	Part III—Specifically identified portions of the Company’s definitive Proxy Statement to be filed in connection with the Company’s 2024 annual meeting of stockholders (the “2024 Annual Meeting”), to be held on May 6, 2024, are incorporated herein by reference.
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0000874716

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Firm ID	238
Auditor Location	Boston, Massachusetts

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 453,932	$ 112,546
Accounts receivable, net of allowance of $9,501 in 2023 and $8,265 in 2022	457,445	400,619
Inventories	380,282	367,823
Other current assets	203,595	220,489
Total current assets	1,495,254	1,101,477
Long-Term Assets:
Property and equipment, net	702,177	649,474
Operating lease right-of-use assets	115,499	118,618
Goodwill	365,961	361,795
Intangible assets, net	84,500	97,672
Other long-term assets	496,534	417,729
Total long-term assets	1,764,671	1,645,288
TOTAL ASSETS	3,259,925	2,746,765
Current Liabilities:
Accounts payable	110,643	110,221
Accrued liabilities	478,712	433,662
Credit facility	250,000	579,000
Current portion of long-term debt	74,997	74,982
Current portion of deferred revenue	37,195	37,938
Total current liabilities	951,547	1,235,803
Long-Term Liabilities:
Deferred income tax liabilities	7,235	8,150
Long-term debt, net of current portion	622,883	694,387
Long-term deferred revenue, net of current portion	28,533	30,862
Long-term operating lease liabilities	99,671	101,239
Other long-term liabilities	65,526	67,587
Total long-term liabilities	823,848	902,225
Total liabilities	1,775,395	2,138,028
Commitments and Contingencies (Note 16)
Stockholders’ Equity:
Common stock, $0.10 par value: Authorized: 120,000 shares; Issued: 107,506 shares in 2023 and 107,193 shares in 2022; Outstanding: 83,032 shares in 2023 and 82,894 shares in 2022	10,751	10,719
Additional paid-in capital	1,569,565	1,463,215
Deferred stock units: Outstanding: 59 units in 2023 and 58 units in 2022	5,530	5,182
Retained earnings	4,444,571	3,599,529
Accumulated other comprehensive loss	(71,206)	(77,796)
Treasury stock, at cost: 24,474 shares in 2023 and 24,299 shares in 2022	(4,474,681)	(4,392,112)
Total IDEXX Laboratories, Inc. stockholders’ equity	1,484,530	608,737
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 3,259,925	$ 2,746,765

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 9,501	$ 8,265
Common stock, par value (in USD per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	107,506,000	107,193,000
Common stock, shares outstanding (in shares)	83,032,000	82,894,000
Deferred stock units, outstanding (in shares)	59,000	58,000
Treasury stock, shares (in shares)	24,474,000	24,299,000

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue:
Total revenue	$ 3,660,953	$ 3,367,324	$ 3,215,360
Cost of Revenue:
Total cost of revenue	1,470,983	1,362,986	1,325,928
Gross profit	2,189,970	2,004,338	1,889,432
Expenses:
Sales and marketing	566,066	524,505	486,735
General and administrative	335,825	326,248	309,660
Research and development	190,951	254,820	161,009
Income from operations	1,097,128	898,765	932,028
Interest expense	(41,581)	(39,858)	(29,808)
Interest income	5,629	1,065	434
Income before provision for income taxes	1,061,176	859,972	902,654
Provision for income taxes	216,134	180,883	157,810
Net income	845,042	679,089	744,844
Less: Net (loss) attributable to noncontrolling interest	0	0	(1)
Net income attributable to IDEXX Laboratories, Inc. stockholders	$ 845,042	$ 679,089	$ 744,845
Earnings per Share:
Basic (in USD per share)	$ 10.17	$ 8.12	$ 8.74
Diluted (in USD per share)	$ 10.06	$ 8.03	$ 8.60
Weighted Average Shares Outstanding:
Basic (in shares)	83,066	83,623	85,200
Diluted (in shares)	83,978	84,600	86,572
Product revenue
Revenue:
Total revenue	$ 2,089,936	$ 1,928,773	$ 1,875,308
Cost of Revenue:
Total cost of revenue	717,951	656,511	656,823
Service revenue
Revenue:
Total revenue	1,571,017	1,438,551	1,340,052
Cost of Revenue:
Total cost of revenue	$ 753,032	$ 706,475	$ 669,105

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 845,042	$ 679,089	$ 744,844
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	17,725	(25,692)	(26,731)
Defined benefit plans, net of tax expense of $(267) in 2023, $(613) in 2022, and $— in 2021	(1,302)	(3,282)	0
Reclassification adjustment for defined benefit plans included in net income, net of tax of $111 in 2023, $99 in 2022, and $— in 2021	519	506	0
Unrealized gain (loss) on Euro-denominated notes, net of tax expense (benefit) of $(811) in 2023, $1,411 in 2022, and $2,011 in 2021	(2,601)	4,525	6,404
Unrealized gain (loss) on investments, net of tax expense (benefit) of $3 in 2023, $(14) in 2022, and $46 in 2021	8	(46)	146
Unrealized gain (loss) on derivative instruments:
Unrealized gain (loss) on foreign currency exchange contracts, net of tax expense (benefit) of $(143) in 2023, $5,954 in 2022, and $2,133 in 2021	(792)	14,851	9,139
Unrealized gain (loss) on cross currency swaps, net of tax expense (benefit) of $(1,754) in 2023, $1,190 in 2022, and $1,699 in 2021	(5,629)	3,817	5,399
Unrealized gain (loss) on interest rate swap, net of tax expense (benefit) of $976 in 2023, $— in 2022, and $— in 2021	3,131	0	0
Reclassification adjustment for (gain) loss included in net income, net of tax (expense) benefit of $(1,699) in 2023, $(6,742) in 2022, and $1,347 in 2021	(4,469)	(18,991)	5,774
Unrealized gain (loss) on derivative instruments	(7,759)	(323)	20,312
Other comprehensive gain (loss), net of tax	6,590	(24,312)	131
Comprehensive income	851,632	654,777	744,975
Less: comprehensive income attributable to noncontrolling interest	0	0	(1)
Comprehensive income attributable to IDEXX Laboratories, Inc.	$ 851,632	$ 654,777	$ 744,976

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Defined benefit plans, tax expense	$ (267)	$ (613)	$ 0
Reclassification adjustment for defined benefit plans included in net income, tax	111	99	0
Unrealized gain (loss) on Euro-denominated notes, tax expense (benefit)	(811)	1,411	2,011
Unrealized gain (loss) on investments, tax expense (benefit)	3	(14)	46
Unrealized gain (loss) on foreign currency exchange contracts, tax expense (benefit)	(143)	5,954	2,133
Unrealized gain (loss) on cross currency swaps, tax expense (benefit)	(1,754)	1,190	1,699
Unrealized gain (loss) on interest rate swap, net of tax expense (benefit)	976	0	0
Reclassification adjustment for (gain) loss included in net income, tax (expense) benefit	$ (1,699)	$ (6,742)	$ 1,347

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Deferred Stock Units	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Balance beginning of period (in shares) at Dec. 31, 2020		106,457
Balance beginning of period at Dec. 31, 2020	$ 632,795	$ 10,646	$ 1,294,849	$ 4,503	$ 2,175,595	$ (53,615)	$ (2,799,890)	$ 707
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	744,844				744,845			(1)
Other comprehensive gain (loss), net	131					131
Acquisition of noncontrolling interest (Note 4)	(990)		(284)					(706)
Repurchases of common stock, net	(770,801)						(770,801)
Common stock issued under stock plans, net (in shares)		421
Common stock issued under stock plans, net	46,258	$ 42	46,228	(12)
Deferred stock units activity	0		(1,035)	1,035
Share-based compensation cost	37,755		37,562	193
Balance end of period (in shares) at Dec. 31, 2021		106,878
Balance end of period at Dec. 31, 2021	689,992	$ 10,688	1,377,320	5,719	2,920,440	(53,484)	(3,570,691)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	679,089				679,089
Other comprehensive gain (loss), net	(24,312)					(24,312)
Acquisition of noncontrolling interest (Note 4)	0
Repurchases of common stock, net	(821,421)						(821,421)
Common stock issued under stock plans, net (in shares)		315
Common stock issued under stock plans, net	35,619	$ 31	36,654	(1,066)
Deferred stock units activity	0		(459)	459
Share-based compensation cost	$ 49,770		49,700	70
Balance end of period (in shares) at Dec. 31, 2022	107,193	107,193
Balance end of period at Dec. 31, 2022	$ 608,737	$ 10,719	1,463,215	5,182	3,599,529	(77,796)	(4,392,112)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	845,042				845,042
Other comprehensive gain (loss), net	6,590					6,590
Repurchases of common stock, net	(82,569)						(82,569)
Common stock issued under stock plans, net (in shares)		313
Common stock issued under stock plans, net	46,991	$ 32	46,984	(25)
Deferred stock units activity	0		(345)	345
Share-based compensation cost	$ 59,739		59,711	28
Balance end of period (in shares) at Dec. 31, 2023	107,506	107,506
Balance end of period at Dec. 31, 2023	$ 1,484,530	$ 10,751	$ 1,569,565	$ 5,530	$ 4,444,571	$ (71,206)	$ (4,474,681)	$ 0

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Common stock, par value (in USD per share)	$ 0.10	$ 0.10	$ 0.10	$ 0.10

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities:
Net income	$ 845,042	$ 679,089	$ 744,844
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	114,908	111,900	104,596
Impairment charge	1,484	2,346	5,148
Provision for uncollectible accounts	5,552	5,829	1,484
Deferred income taxes	(48,306)	(35,065)	(3,377)
Share-based compensation expense	59,739	49,770	37,755
Other	520	2,645	2,619
Changes in assets and liabilities:
Accounts receivable	(53,871)	(41,398)	(33,141)
Inventories	(28,651)	(121,731)	(52,919)
Accounts payable	(557)	3,467	11,233
Deferred revenue	(3,032)	(11,019)	(7,551)
Other assets and liabilities	13,682	(102,849)	(55,145)
Net cash provided by operating activities	906,510	542,984	755,546
Cash Flows from Investing Activities:
Purchases of property and equipment	(133,631)	(148,838)	(119,549)
Acquisitions of intangible assets	0	(10,000)	0
Equity investments	0	(25,000)	0
Acquisitions of businesses, net of cash acquired	0	(11,512)	(173,418)
Proceeds from net investment hedges	8,377	0	0
Net cash used by investing activities	(125,254)	(195,350)	(292,967)
Cash Flows from Financing Activities:
(Repayments) borrowings on credit facility, net	(329,000)	505,500	73,500
Payments of senior notes	(75,000)	(75,000)	(50,000)
Debt issuance costs	0	(435)	(2,650)
Purchase of minority interest	0	0	(990)
Repurchases of common stock, net	(71,920)	(819,711)	(746,777)
Proceeds from exercises of stock options and employee stock purchase plans	47,034	35,747	46,565
Payment of acquisition-related contingent consideration and holdbacks	(3,135)	(6,431)	(1,500)
Shares withheld for statutory tax withholding payments on restricted stock	(9,975)	(10,606)	(15,562)
Net cash used by financing activities	(441,996)	(370,936)	(697,414)
Net effect of changes in exchange rates on cash	2,126	(8,606)	(4,639)
Net increase (decrease) in cash and cash equivalents	341,386	(31,908)	(239,474)
Cash and cash equivalents at beginning of period	112,546	144,454	383,928
Cash and cash equivalents at end of period	$ 453,932	$ 112,546	$ 144,454

NATURE OF BUSINESS, BASIS OF PR

NATURE OF BUSINESS, BASIS OF PRESENTATION AND PRINCIPLES OF CONSOLIDATION	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
NATURE OF BUSINESS, BASIS OF PRESENTATION AND PRINCIPLES OF CONSOLIDATION	NATURE OF BUSINESS, BASIS OF PRESENTATION AND PRINCIPLES OF CONSOLIDATION The accompanying consolidated financial statements of IDEXX Laboratories, Inc. and its subsidiaries have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and with the requirements of Regulation S-X. These statements include the accounts of IDEXX Laboratories, Inc., and our wholly-owned and majority-owned subsidiaries (“IDEXX,” the “Company,” “we,” or “our”). We do not have any variable interest entities for which we are the primary beneficiary. All intercompany transactions and balances have been eliminated in consolidation. We have included certain terms and abbreviations used throughout these financial statements in the “Glossary of Terms and Selected Abbreviations.” We develop, manufacture, and distribute products and provide services primarily for the companion animal veterinary, livestock and poultry, dairy, and water testing industries. We also sell human medical point-of-care products and laboratory diagnostics. Our principal line of business, which we refer to as our Companion Animal Group (“CAG”) operating segment, provides diagnostic capabilities and information management solutions for the companion animal veterinary industry, as well as the biomedical research community. Our principal regions for these products and services are North America, Europe, Australia, and Japan, but we also sell to customers and distributors in many other countries around the world. Our Water operating segment provides innovative testing solutions for the quality and safety of water principally in the U.S. and Europe, and Brazil, but we also sell to customers in many other countries around the world. Our Livestock, Poultry and Dairy (“LPD”) operating segment provides diagnostic tests and related instrumentation and performs services that are used to manage the health status of livestock and poultry, to improve producer efficiency, and to ensure the quality and safety of milk. Our principal regions for these products and services are Europe, the United States, China, Australia, and Brazil, but we also sell to customers in many other countries around the world. We also operate a smaller operating segment that is comprised of our human medical diagnostic products and services business (“OPTI Medical”). Financial information about our OPTI Medical operating segment is combined and presented with our out-licensing arrangements remaining from our pharmaceutical business in an “Other” category because they do not meet the quantitative or qualitative thresholds for reportable segments. Refer to “Note 3. Revenue” for additional information regarding disaggregated revenue by segment, major product and service categories, and geographical areas. Refer to “Note 17. Segment Reporting” for additional information regarding our reportable operating segments.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (a) Estimates The preparation of these consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures. On an ongoing basis, we evaluate these estimates, including those related to reserves for accounts receivable, customer contract assets and lease receivables; goodwill and other intangible assets; income taxes; inventory valuation; revenue recognition, including product returns and customer contracts with multiple performance obligations; share-based compensation; warranty reserves; self-insurance reserves; fair value measurements; and loss contingencies. We accrue contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ materially from these estimates. ( b ) Cash and Cash Equivalents We consider all highly liquid investments with original maturities of ninety days or less to be cash equivalents. Cash and cash equivalents consist primarily of demand deposits, money market funds, and short-duration agency bonds and commercial paper as described above, which management believes are subject to minimal credit and market risk. There is no restricted cash on our consolidated balance sheets for the years ended December 31, 2023 and 2022. (c) Inventories – Refer to Note 7 (d) Property and Equipment – Refer to Note 9 (e) Goodwill and Other Intangible Assets – Refer to Note 11 (f) Warranty Reserves We provide a standard twelve-month warranty on all diagnostic instruments sold. We recognize the cost of instrument warranties in cost of product revenue at the time revenue is recognized based on the estimated cost to repair the instrument over its warranty period. Cost of product revenue reflects not only estimated warranty expense for instruments sold in the current period, but also any changes in estimated warranty expense for the portion of the aggregate installed base that is under warranty. Estimated warranty expense is based on a variety of inputs, including historical instrument performance in the customers’ environments, historical and estimated costs incurred in servicing instruments, and projected instrument reliability. Should actual service rates or costs differ from our estimates, revisions to the estimated warranty liability would be required. The liability for warranties is included in accrued liabilities in the accompanying consolidated balance sheets. The amount of warranty reserve during the years ended December 31, 2023 and 2022 was not material. (g) Income Taxes – Refer to Note 14 (h) Taxes Remitted to Governmental Authorities by IDEXX on Behalf of Customers We calculate, collect from our customers, and remit to governmental authorities sales, value-added, and excise taxes assessed by governmental authorities in connection with revenue-producing transactions with our customers. We report these taxes on a net basis and do not include these tax amounts in revenue or cost of product or service revenue. (i) Revenue – Refer to Note 3 (j) Research and Development Costs Research and development costs, which consist of employee compensation and benefits, certain licensing costs, materials, external consulting, and product development costs, are expensed as incurred. We evaluate our research and development costs for capitalization after the technological feasibility has been established for software and products containing software to be sold; however, no costs were capitalized during the years ended December 31, 2023, 2022, and 2021. Software developed to deliver hosted services to our customers has been designated as internal-use, and we capitalize certain costs incurred in connection with developing or obtaining software designated for internal use based on three distinct stages of development. Refer to “Note 9. Property and Equipment, Net” for further information on internal-use software. (k) Advertising Costs Advertising costs, which are recognized as sales and marketing expense in the period in which they are incurred, were $4.2 million, $5.0 million, and $3.3 million for the years ended December 31, 2023, 2022, and 2021, respectively. (l) Legal Costs Legal costs are considered period costs and, accordingly, are expensed in the year services are provided. (m) Share-Based Compensation – Refer to Note 5 (n) Leases – Refer to Note 8 (o) Earnings per Share – Refer to Note 15 (p) Foreign Currency The functional currency of most of our foreign subsidiaries is their local currency, and a small number of our foreign subsidiaries that conduct business primarily in U.S. dollars have the U.S. dollar as their functional currency. Assets and liabilities of our other foreign subsidiaries, whose functional currency is their local currency, are translated to the U.S. dollar using the exchange rate in effect at the balance sheet date. Revenue and expense accounts are translated to the U.S. dollar using the exchange rate at the date at which those elements are recognized, and where it is impractical to do so, an average exchange rate in effect during the period is used to translate those elements. Cumulative translation gains and losses are shown in the accompanying consolidated balance sheets as a separate component of accumulated other comprehensive income (“AOCI”). Revenues and expenses denominated in a currency other than the respective subsidiary’s functional currency are recorded at the current exchange rate when the transaction is recognized. Monetary assets and liabilities denominated in a currency other than the respective subsidiary’s functional currency are remeasured at each balance sheet date using the exchange rate in effect at each balance sheet date. These foreign currency gains and losses are included in general and administrative expenses within our Other segment. We recognized aggregate foreign currency losses of $1.1 million, $3.4 million, and $2.1 million for the years ended December 31, 2023, 2022, and 2021, respectively. (q) Hedging Instruments – Refer to Note 19 (r) Fair Value Measurements – Refer to Note 18 (s) Comprehensive Income We report all changes in equity, including net income and transactions or other events and circumstances from non-owner sources during the period in which they are recognized. We have chosen to present comprehensive income, which encompasses net income, foreign currency translation adjustments, gains and losses on our net investment hedges, defined benefit plan adjustments, and the difference between the cost and the fair market value of investments in debt and equity securities, forward currency exchange contracts, and interest rate swap contracts in the consolidated statements of comprehensive income. Refer to “Note 21. Accumulated Other Comprehensive Income” for information about the effects on net income of significant amounts reclassified out of each component of AOCI for the years ended December 31, 2023, 2022, and 2021. (t) Equity and Cost Methods of Accounting for Investments Investments where we have the ability to exercise significant influence, but do not control the entity, are accounted for under the equity method of accounting. Significant influence generally exists if we have a 20% to 50% ownership interest in the investee. Equity investments in entities for which we do not have the ability to exercise significant influence and whose securities do not have a readily determinable fair value are carried at cost less impairment, if any, adjusted for changes resulting from qualifying observable price changes for the identical investment of the same issuer should they occur. We evaluate our investments for impairment whenever events or changes in circumstances indicate that the carrying amounts of such investments may be impaired. If a decline in the value of an investment is determined to be other than temporary, a loss is recorded in earnings in the current period. Our equity investments of $30.3 million, for both the years ended December 31, 2023 and 2022, are recorded at cost in other long-term assets. Refer to “Note 4. Acquisitions, Asset Purchases and Investments” for additional information regarding our acquisition of certain equity investments. (u) Concentrations of Risk Financial Instruments . Financial instruments that potentially subject us to concentrations of credit risk are principally cash, cash equivalents, accounts receivable, contract assets, lease receivables, and derivatives. To mitigate such risk with respect to cash and cash equivalents, we place our cash with highly-rated financial institutions, in non-interest bearing accounts that are insured by the U.S. government and money market funds invested in government securities. To reduce credit risk with respect to accounts receivable, contract assets, and lease receivables, we routinely assess the financial strength of our most significant customers and monitor the amounts owed to us, taking appropriate action when necessary. Concentrations of credit risk with respect to accounts receivable are limited due to the large number of customers that purchase our products and services, and we have no significant customers that accounted for greater than 10% of our consolidated revenues during the year ended December 31, 2023. As a result, we believe that accounts receivable, contract assets, and lease receivables credit risk exposure is limited. We maintain allowances for expected credit losses, but historically have not experienced material losses related to an individual customer or group of customers in any particular industry or geographic area. To mitigate concentration of credit risk with respect to derivatives, we enter into transactions with highly-rated financial institutions, enter into master netting arrangements with counterparties to our derivative transactions, and frequently monitor the creditworthiness of our counterparties. Our master netting arrangements reduce our exposure in that they permit outstanding receivables and payables with the counterparties to our derivative transactions to be offset in the event of default. We have not incurred such losses and consider the risk of counterparty default to be minimal. Sole and Single-Source Suppliers . Many of the third parties that provide us with the instruments we sell, as well as certain components, raw materials and consumables used in or with our products, are sole or single-source suppliers. Some of the products that we purchase from these suppliers are proprietary or complex in nature, and, therefore, cannot be readily or easily replaced by alternative sources. We have a process of qualifying alternative third-party suppliers for select components and materials, which must meet approvals internally and from various regulatory agencies before we are able to use and sell products using these alternative sources. If we are unable to obtain adequate quantities of inventory, we could face cost increases or delays or discontinuations in product shipments, which could have a material adverse effect on our results of operations. Under certain long-term supply arrangements we paid the supplier for costs related to molds, dies and other tools used for the production of products we purchase. These payments are capitalized in other assets, as we do not have title or control of the underlying production assets, and are amortized to cost of sales. (v) New Accounting Pronouncements Adopted Effective January 1, 2021, we adopted ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” The new guidance is intended to simplify the accounting for income taxes by removing certain exceptions and by updating accounting requirements around goodwill recognized for tax purposes and the allocation of current and deferred tax expense among legal entities, among other minor changes. The adoption of ASU 2019-12 did not have a material impact on our consolidated financial statements. In July 2021, the FASB issued ASU 2021-05, “Leases (Topic 842); Lessors - Certain Leases with Variable Lease Payments.” ASU 2021-05 requires a lessor to classify a lease with variable payments that do not depend on an index or rate as an operating lease if another lease classification (i.e., sales-type or direct financing) would result in recognition of a day-one loss. We elected to adopt this standard as of the third quarter of 2021, on a prospective basis. The adoption of ASU 2021-05 did not have a material impact on our consolidated financial statements. We adopted ASU 2022-04, “Liabilities - Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations,” as of January 1, 2023, which adds certain disclosure requirements for a buyer in a supplier finance program. The amendments in this update require that a buyer in a supplier finance program discloses sufficient information about the program to allow a user of financial statements to understand the program's nature, activity during the period, changes from period to period, and potential magnitude. Refer to “Note 12. Accounts Payable, Accrued Liabilities and Other Long-Term Liabilities.” We adopted ASU 2021-08, “Business Combinations (Topic 805): Accounting for Acquired Contract Assets and Contract Liabilities,” as of January 1, 2023. ASU 2021-08 is intended to improve comparability for both the recognition and measurement of acquired revenue contracts with customers at the date of and after a business combination by providing consistent recognition guidance. The adoption of ASU 2021-08 did not have a material impact on our consolidated financial statements. (w) New Accounting Pronouncements Not Yet Adopted In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant expenses. The amendments will require disclosure of significant segment expenses that are regularly provided to the chief operating decision maker and included within segment profit and loss. The amendments are effective for annual periods beginning after December 15, 2023, and interim periods beginning after December 15, 2024, with early adoption permitted, and will be applied retrospectively to all prior periods presented in the financial statements. We are currently evaluating ASU 2023-07 to determine its impact on our consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which includes amendments that further enhance income tax disclosures, primarily through standardization and disaggregation of income tax rate reconciliation categories and income taxes paid by jurisdiction. The amendments are effective for annual periods beginning after December 15, 2024, with early adoption permitted, and may be applied either prospectively or retrospectively. We are currently evaluating ASU 2023-09 to determine its impact on our consolidated financial statements.

REVENUE

REVENUE	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Revenue Recognition We recognize revenue when, or as, performance obligations under the terms of a contract are satisfied, which occurs when control of the promised products or services is transferred to a customer, and it is probable that we will collect substantially all of the consideration to which we will be entitled, based on the customer’s intent and ability to pay the promised consideration. We exclude sales, use, value-added, and other taxes we collect on behalf of third parties from revenue. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring products or services to a customer. To accurately present the consideration received in exchange for promised products or services, we apply the five-step model outlined below: 1. Identification of a contract or agreement with a customer 2. Identification of our performance obligations in the contract or agreement 3. Determination of the transaction price 4. Allocation of the transaction price to the performance obligations 5. Recognition of revenue when, or as, we satisfy a performance obligation We enter into contracts where customers purchase combinations of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. The timing of revenue recognition, billings, and cash collections results in accounts receivable, lease receivables, and contract assets arising when revenue is recognized in advance of billings, and contract liabilities or deferred revenue as a result of receiving consideration in advance of revenue recognition within our consolidated balance sheet. Customer payment terms are typically 30 to 60 days, and these terms vary by location based on local business practices and by customer. Customer contracts are modified primarily to create new, or change existing, enforceable rights and obligations. Customer contract modifications typically create new performance obligations to deliver additional goods and/or services that are distinct from the goods and/or services transferred before the modification, and the related increase in consideration does not reflect the standalone selling price for the additional goods and/or services. We account for these modifications prospectively as if it were a termination of the existing contract and the creation of a new contract, and we allocate the sum of the remaining consideration of the original contract that has not been recognized as revenue and the incremental consideration promised as part of the modification to the remaining performance obligations. From time to time we have other types of contract modifications. Contract modifications that create new performance obligations to deliver additional goods and/or services that are distinct from the goods and/or services transferred before the modification, and the related increase in consideration approximates the standalone selling price for the additional goods and/or services, are accounted for as separate contracts. Contract modifications that do not create new performance obligations, but the goods and/or services to be delivered after the contract modification date are distinct from the goods and/or services transferred before the modification, are accounted for as a termination of the existing contract and the creation of a new contract. Revenues by Product and Service Categories and by Principal Geographic Areas We present disaggregated revenue for our CAG segment based on major product and service categories. Our Water and LPD segments are comprised of a single major product category. The following table presents revenue by major product and service categories: (in thousands) For the Years Ended December 31, 2023 2022 2021 CAG segment revenue: CAG Diagnostics recurring revenue: $ 2,935,425 $ 2,660,280 $ 2,534,562 IDEXX VetLab consumables 1,188,261 1,057,236 1,006,781 Rapid assay products 344,494 313,667 296,852 Reference laboratory diagnostic and consulting services 1,278,617 1,178,113 1,123,656 CAG Diagnostics services and accessories 124,053 111,264 107,273 CAG Diagnostics capital - instruments 137,603 147,326 149,140 Veterinary software, services and diagnostic imaging systems: 279,328 251,187 206,258 Recurring revenue 214,597 180,973 147,498 Systems and hardware 64,731 70,214 58,760 CAG segment revenue 3,352,356 3,058,793 2,889,960 Water segment revenue 168,149 155,720 146,505 LPD segment revenue 121,659 122,607 135,887 Other segment revenue 18,789 30,204 43,008 Total revenue $ 3,660,953 $ 3,367,324 $ 3,215,360 The following table presents revenue by principal geographic area, based on customers’ domiciles: (in thousands) For the Years Ended December 31, 2023 2022 2021 Americas United States $ 2,391,427 $ 2,182,959 $ 1,995,683 Canada 150,110 142,743 139,727 Latin America & Caribbean 83,923 75,035 66,623 2,625,460 2,400,737 2,202,033 Europe, the Middle East and Africa Germany 149,789 137,876 146,762 United Kingdom 121,745 110,400 114,955 France 96,797 84,479 90,836 Italy 53,787 48,192 52,062 Spain 52,332 46,982 48,169 Switzerland 34,830 30,646 31,984 Netherlands 30,508 26,882 29,656 Other 176,396 161,577 167,525 716,184 647,034 681,949 Asia Pacific Region Australia 95,465 96,408 94,414 Japan 75,569 77,661 84,275 China 44,168 49,193 63,166 Other 104,107 96,291 89,523 319,309 319,553 331,378 Total $ 3,660,953 $ 3,367,324 $ 3,215,360 Major Categories of Revenue for our Products and Services Diagnostic Products and Accessories . Diagnostic products and accessories revenues, including IDEXX VetLab ® consumables and accessories, rapid assay, LPD, Water, and OPTI testing products, are predominantly recognized and invoiced at the time of shipment, which is when the customer obtains control of the product based on legal title transfer and we have the right to payment. We also provide customers with certain consumables that are recognized upon utilization by the customer, which is when we have the right to payment and the risks and rewards of ownership transfer. Shipping costs reimbursed by the customer are included in revenue and cost of sales. As a practical expedient, we do not account for shipping activities as a separate performance obligation. Laboratory Diagnostic and Consulting Services . Laboratory diagnostic and consulting services revenues are recognized and invoiced when the laboratory diagnostic service is performed. Instruments, Software and Systems . CAG Diagnostics capital instruments, diagnostic imaging systems, veterinary software licenses and computer hardware revenues are recognized and invoiced when the customer obtains control of the products based on legal title transfer and we have the right to payment, which generally occurs at the time of installation and customer acceptance. Our instruments, software, and systems are often included in one of our significant customer programs, as further described below. SaaS Subscriptions . We offer a variety of veterinary software and diagnostic imaging SaaS subscriptions including ezyVet, Animana, Neo, Pet Health Network Pro, Petly Plans, Web PACS, rVetLink, SmartFlow, and Vet Radar. We recognize revenue for our SaaS subscriptions over time on a ratable basis over the contract term, beginning on the date our service is made available to the customer. Our subscription contracts vary in term from monthly to two years. Customers typically pay for our subscription contracts in equal monthly amounts over the term of the arrangement. Deferred revenue related to our SaaS subscriptions is not material. Extended Warranties and Post-Contract Support . CAG Diagnostics capital instruments and diagnostic imaging systems extended warranties typically provide customers with continued coverage for a period of one five years Veterinary software post-contract support provides customers with access to technical support when and as needed through access to call centers and online customer assistance. Post-contract support contracts typically have a term of twelve months and customers are billed for post-contract support in equal quarterly amounts over the term. We recognize revenue for post-contract support services over time on a ratable basis using a time-elapsed measure of performance over the contract term, which approximates the expected timing in which applicable services are performed. Contracts with Multiple Performance Obligations We enter into arrangements with multiple performance obligations where customers purchase a combination of IDEXX products and services. Determining whether products and services are considered distinct performance obligations that should be accounted for separately requires significant judgment. We determine the transaction price for a contract based on the total consideration we expect to receive in exchange for the transferred goods or services. To the extent the transaction price includes variable consideration, such as volume rebates or expected price adjustments, we apply judgment in constraining the estimated variable consideration due to factors that may cause reversal of revenue recognized. We evaluate constraints based on our historical and projected experience with similar customer arrangements. We allocate revenue to each performance obligation in proportion to the relative standalone selling prices, and recognize revenue when transfer of the related goods or services has occurred for each obligation. We utilize the observable standalone selling price when available, which represents the price charged for the promised product or service when sold separately. When standalone selling prices for our products or services are not directly observable, we determine the standalone selling prices using relevant information available and apply suitable estimation methods including, but not limited to, the cost plus a margin approach. We recognize revenue as each performance obligation is satisfied, either at a point in time or over time, as described in the revenue categories above. We do not disclose information about remaining performance obligations that are part of arrangements with an original expected duration of one year or less. The following customer arrangements represent our most significant customer contracts that contain multiple performance obligations: Customer Commitment Arrangements . We offer customers incentives upon entering into multi-year arrangements to purchase annual minimum amounts of products and services. Free or Discounted Instruments and Systems . Many of our customer commitment arrangements, such as our IDEXX 360 program, provide customers with free or discounted instruments or systems upon entering into multi-year arrangements to purchase annual minimum amounts of products and services. We allocate total consideration, including future committed purchases and expected price adjustments, based on relative standalone selling prices to identified performance obligations and recognize instrument revenue and cost at the time of installation and customer acceptance in advance of billing the customer, which is also when the customer obtains control of the instrument based on legal title transfer. Our right to future consideration related to instrument revenue is recorded as a contract asset within other current and long-term assets. The contract asset is transferred to accounts receivable when customers are billed for products and services over the term of the arrangement. We have determined that these arrangements do not include a significant financing component. On December 31, 2022, our contract assets were $190.8 million, of which approximately $43.2 million was reclassified to accounts receivable when customers were billed for related products and services during the year ended December 31, 2023. Furthermore, as a result of new placements under commitment arrangements, net of subsequent amounts reclassified to accounts receivable and allowances established for credit losses, our contract assets were $223.1 million at December 31, 2023. We monitor customer purchases over the term of their arrangement to assess the realizability of our contract assets and review estimates of variable consideration. Impairments and revenue adjustments that relate to performance obligations satisfied in prior periods, including cumulative catch-up adjustments to revenue arising from contract modifications, during the years ended December 31, 2023 and 2022, were not material. Up-Front Consideration Paid to Customers . We provide customers with incentives in the form of IDEXX Points upon entering into multi-year arrangements to purchase annual minimum amounts of future products and/or services (previously referred to as “up-front customer loyalty programs”). If a customer breaches their agreement, they are required to refund all or a portion of the up-front consideration, or make other repayments, remedial actions, or both. Up-front incentives to customers (previously referred to as “customer acquisition costs”) in the form of IDEXX Points or, from time to time, cash, are not made in exchange for distinct goods or services and are capitalized as consideration paid to customers within other current and long-term assets, which are subsequently recognized as a reduction to revenue over the term of the customer arrangement. If these up-front incentives are subsequently utilized to purchase instruments, we allocate total consideration, including future committed purchases less up-front incentives and estimates of expected price adjustments, based on relative standalone selling prices, to identified performance obligations, and recognize instrument revenue and cost at the time of installation and customer acceptance. To the extent invoiced instrument revenue exceeds recognized instrument revenue, we record deferred revenue as a contract liability, which is subsequently recognized upon the purchase of products and services over the term of the contract. We have determined these arrangements do not include a significant financing component. On December 31, 2022, our capitalized consideration paid to customers was $158.0 million, of which approximately $50.9 million was recognized as a reduction of revenue during the year ended December 31, 2023. Furthermore, as a result of new payments to customers, net of subsequent recognition, our capitalized consideration paid to customer was $168.9 million at December 31, 2023. We monitor customer purchases over the term of their arrangement to assess the realizability of our capitalized consideration paid to customers and review estimates of variable consideration. Impairments and revenue adjustments that relate to performance obligations satisfied in prior periods, including cumulative catch-up adjustments to revenue arising from contract modifications, during the years ended December 31, 2023 and 2022, were not material. Rebate Arrangements . Our rebate arrangements provide customers the opportunity to earn future rebates based on the volume of products and/or services they purchase over the term of the arrangement. Rebate incentives are typically offered in multi-year arrangements that include customer commitments to purchase annual minimum amounts of products and services, or, to a lesser extent, are sometimes offered without future purchase commitments. We account for the customer’s right to earn rebates on future purchases as a separate performance obligation and determine the standalone selling price based on an estimate of rebates the customer will earn over the term of the arrangement. Total consideration allocated to identified performance obligations is limited to goods and services that the customer is presently obligated to purchase and does not include estimates of future purchases that are optional. We allocate total consideration to identified performance obligations, including the customer’s right to earn rebates on future purchases, which is deferred and subsequently recognized upon the purchase of products and/or services, partly offsetting rebates as they are earned. On December 31, 2022, our deferred revenue related to rebate and up-front consideration arrangements was $36.1 million, of which approximately $12.6 million was recognized when customers purchased eligible products and services during the year ended December 31, 2023. Furthermore, as a result of new customer purchases under rebate and up-front consideration arrangements, net of subsequent recognition, our deferred revenue was $32.9 million at December 31, 2023, of which approximately 33%, 26%, 19%, 13%, and 9% are expected to be recognized during 2024, 2025, 2026, 2027, and thereafter, respectively. For our customer commitment arrangements, we estimate future revenues related to multi-year arrangements to be approximately $3.8 billion, of which approximately 28%, 24%, 20%, 15%, and 13% are expected to be recognized during 2024, 2025, 2026, 2027, and thereafter, respectively. These future revenues relate to performance obligations not yet satisfied, for which customers have committed to future purchases, net of the expected revenue reductions from consideration paid to customers and expected price adjustments, and as a result, are lower than stated contractual commitments by our customers. Instrument Rental Arrangements . Revenues from instrument rental and reagent rental arrangements are recognized either as operating leases on a ratable basis over the term of the arrangement or as sales-type leases at the time of installation and customer acceptance. Customers typically pay for the right to use instruments under rental arrangements in equal monthly amounts over the term of the rental arrangement. For some arrangements, customers are provided with the right to purchase the instrument at the end of the lease term. Our reagent rental arrangements provide customers the right to use our instruments upon entering into multi-year arrangements to purchase annual minimum amounts of consumables. These types of arrangements include an embedded lease for the right to use our instrument and we determine the amount of lease revenue allocated to the instrument based on relative standalone selling prices. Lease revenues are presented in product revenue on our consolidated income statement. Lease revenue was approximately $20.7 million, $20.3 million, and $20.8 million for the years ended December 31, 2023, 2022, and 2021, respectively, including both operating leases and sales-type leases. Sales-type Reagent Rental Arrangements . Our reagent rental arrangements that effectively transfer control of instruments to our customers are classified as sales-type leases and we recognize instrument revenue and cost in advance of billing the customer, at the time of installation and customer acceptance. Our right to future consideration related to instrument revenue is recorded as a lease receivable within other current and long-term assets, and is transferred to accounts receivable when customers are billed for products and services over the term of the arrangement. On December 31, 2022, our lease receivable assets were $18.4 million, of which approximately $4.3 million was reclassified to accounts receivable when customers were billed for related products and services during the year ended December 31, 2023. Furthermore, as a result of new placements under sales-type reagent rental arrangements, net of subsequent amounts reclassified to accounts receivable, and allowances established for credit losses, our lease receivable assets were $23.1 million at December 31, 2023. The impacts of discounting and unearned income at December 31, 2023, were not material. Profit and loss recognized at the commencement date and interest income during the year ended December 31, 2023, were not material. We monitor customer purchases over the term of their arrangement to assess the realizability of our lease receivable assets. Impairments during the year ended December 31, 2023, were not material. Operating-type Reagent Rental Arrangements . Our reagent rental arrangements that do not effectively transfer control of instruments to our customers are classified as operating leases and we recognize instrument revenue and costs ratably over the term of the arrangement. The cost of the instrument is capitalized within property and equipment. During the year ended December 31, 2023, we transferred instrume nts of $14.6 million compared to $17.4 million during the year ended December 31, 2022, from inventory to property and equipment. We estimate future revenue to be recognized related to our reagent rental arrangements of approximately $56.4 million, of which approximately 26%, 23%, 18%, 15%, and 18% are expected to be recognized during 2024, 2025, 2026, 2027, and thereafter, respectively. These future revenues relate to performance obligations not yet satisfied for which customers have committed to future purchases, net of expected price adjustments, and as a result, may be lower than stated contractual commitments by our customers. Other Customer Incentive Arrangements . Certain arrangements with customers include discounts or rebates on the sale of products and services applied retrospectively, such as volume rebates achieved by purchasing a specified purchase threshold of goods and services. We account for these discounts as variable consideration and estimate the likelihood of a customer meeting the threshold in order to determine the transaction price using the most predictive approach. We typically use the most-likely-amount method for incentives that are offered to individual customers, and the expected-value method for arrangements that are offered to a broad group of customers. Revenue adjustments that relate to performance obligations satisfied in prior periods, including cumulative catch-up adjustments to revenue arising from contract modifications, during the years ended December 31, 2023 and 2022, were not material. Refund obligations related to customer incentive arrangements are recorded in accrued liabilities for the actual issuance of incentives, incentives earned but not yet issued, and estimates of incentives to be earned in the future. Combined Arrangements . At times, we combine aspects of customer commitment arrangements, instrument rental arrangements and other incentives within a single customer arrangement. We separate each significant element and include the contract assets, consideration paid to customers, deferred revenues, and estimated future revenues within the most relevant disclosures above. Each customer contract is presented as a net contract asset or net contract liability on our consolidated balance sheet. Deferred Extended Warranties and Post-Contract Support Revenue On December 31, 2022, our deferred revenue related to extended warranties and post-contract support was $26.4 million, of which approximately $19.8 million was recognized during the year ended December 31, 2023. Furthermore, as a result of new arrangements, our deferred revenue related to extended warranties and post-contract support was $26.0 million at December 31, 2023. We do not disclose information about remaining performance obligations that are part of contracts with an original expected duration of one year or less, and do not adjust for the effect of the financing components when the period between customer payment and revenue recognition is one year or less. Deferred revenue related to extended warranties and post-contract support with an original duration of more than one year was $9.7 million at December 31, 2023, of which approximately 43%, 29%, 16%, 7%, and 5% are expected to be recognized during 2024, 2025, 2026, 2027, and thereafter, respectively. We have determined these arrangements do not include a significant financing component. IDEXX Points IDEXX Points may be applied to trade receivables due to us, converted to cash, or applied against the purchase price of IDEXX products and services. We consider IDEXX Points equivalent to cash. IDEXX Points that have not yet been used by customers are included in accrued liabilities until utilized or expired. Breakage is not material because customers can apply IDEXX Points to trade receivables at any time. Costs to Obtain a Contract We capitalize sales commissions and the related fringe benefits earned by our sales force when considered incremental and recoverable costs of obtaining a contract that includes future performance obligations. Our contracts include performance obligations related to various goods and services, some of which are satisfied at a point in time and others over time. Commission costs related to performance obligations satisfied at a point in time are expensed at the time of sale, which is when revenue is recognized. Commission costs related to long-term service contracts and performance obligations satisfied over time, including extended warranties and SaaS subscriptions, are deferred and recognized on a systematic basis that is consistent with the transfer of the goods or services to which the asset relates. We apply judgment in estimating the amortization period, which ranges from 3 to 7 years, by taking into consideration our customer contract terms, history of renewals, and expected length of customer relationship, as well as the useful life of the underlying technology and products. Amortization expense is included in sales and marketing expenses in the accompanying consolidated statements of income. Deferred commission costs are periodically reviewed for impairment. On December 31, 2022, our deferred commission costs, included within other current and long-term assets, were $19.2 million, of which approximately $6.5 million of commission expense was recognized during the year ended December 31, 2023. Furthermore, as a result of commissions related to new extended warranties and SaaS subscriptions, net of subsequent recognition, our deferred commission costs were $19.7 million at December 31, 2023. Impairments of deferred commission costs during the years ended December 31, 2023 and 2022, were not material.

ACQUISITIONS, ASSET PURCHASES A

ACQUISITIONS, ASSET PURCHASES AND INVESTMENTS	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
ACQUISITIONS, ASSET PURCHASES AND INVESTMENTS	ACQUISITIONS, ASSET PURCHASES AND INVESTMENTS We believe that our acquisitions of businesses and other assets enhance our existing businesses by either expanding our geographic range, customer base, or existing product and service lines. From time to time, we may acquire small reference laboratories or radiology practices that we account for as either asset purchases or business combinations. Asset Purchases and Investments During 2022, we entered into two discrete arrangements to license intellectual property for which we paid $65.0 million and accrued $15.0 million in subsequent payments, all of which was charged to research and development expense. The $15.0 million milestone payment was issued in the first quarter of 2023. These two arrangements were treated as asset acquisitions under U.S. GAAP and resulted in the full amount being expensed to research and development expense as in-process research and development costs with no alternative future use. The acquisitions of these licensing arrangements supports new instrument platform advancements. We also made a $10.0 million payment for a perpetual intellectual property license, which will be amortized over 10 years. The research and development expense and amortization expense were recorded in our CAG segment. During 2022, we also purchased $25.0 million of preferred shares for a noncontrolling minority interest in one of the entities with which we have a license agreement. We have elected to measure the investment as an equity security investment, under ASC 321, “Investments - Equity Securities,” and recorded the investment at cost. The investment is included in other long-term assets. Business Combinations During the third quarter of 2022, we acquired the assets of an international water testing company located in Canada for approximately $12.8 million in cash, including a holdback of approximately $1.3 million, which was paid in the fourth quarter of 2023. This acquisition expands our product offering in the Water segment. The fair values of the assets and liabilities acquired consist of technology intangibles of approximately $3.4 million, with a life of 10 years; customer relationship intangibles of approximately $1.2 million, with a life of 10 years; approximately $6.9 million of goodwill, representing synergies with our Water testing portfolio; and approximately $1.3 million of tangible assets, including inventory and accounts receivable. Goodwill related to this acquisition is expected to be deductible for tax purposes. Pro forma information has not been presented for this acquisition because such information is not material to the financial statements. The results of operations have been included in our Water segment since the acquisition date. The acquisition expenses were not material. During the fourth quarter of 2021, we acquired the shares of a reference laboratory located in Finland for approximately $13.4 million in cash, including a holdback of approximately $1.4 million , which was paid in the first quarter of 2023. This acquisition expands our international reference laboratory presence and was accounted for as a business combination. The fair values of the assets acquired consist of customer relationship intangibles of approximately $7.4 million, with a life of 10 years; a non-compete agreement of approximately $0.8 million, with a life of 3 years; approximately $6.9 million of goodwill, representing synergies within our broader CAG portfolio; and approximately $1.7 million in net liabilities, including deferred taxes associated with the acquired intangible assets. Goodwill related to this acquisition is not expected to be deductible for tax purposes. Pro forma information has not been presented for this acquisition because such information is not material to the financial statements. The results of operations have been included in our CAG segment since the acquisition date. The acquisition expenses were not material. During the third quarter of 2021, we acquired the assets of a teleradiology business for approximately $5.4 million, including a contingent payment of $0.3 million. This acquisition expands our current teleradiology capability. The acquired assets primarily consist of a customer relationship intangible of approximately $1.7 million, with a weighted average life of 10 years , and approximately $3.7 million in goodwill. Goodwill related to this acquisition is expected to be deductible for tax purposes. Pro forma information has not been presented for this acquisition because such information is not material to the financial statements. The results of operations have been included in our CAG segment since the acquisition date. The acquisition expenses were not material. During the second quarter of 2021, we acquired the assets of the ezyVet cloud-based veterinary software businesses and the shares of ezyVet US, Inc., as well as the Vet Radar business assets, for approximately $157.2 million, including an estimated contingent payment of $5.0 million. The acquired assets include the ezyVet cloud-native practice management system software and the Vet Radar cloud-based workflow management software. The acquisition expands our cloud-based software offerings to support our customers with technology solutions that raise the standards of care for patients and improve practice efficiency. The fair values of assets acquired were as follow: approximately $32.0 million in a customer-related intangible with a weighted average life of 10 years; approximately $8.4 million in technology-related intangibles with a weighted average life of 6 years; approximately $2.4 million in trademarks with a weighted average life of 14 years; approximately $1.8 million in non-compete agreements with a weighted average life of 5 years; approximately $109.4 million in goodwill, r epresenting synergies within our broader CAG portfolio; and approximately $3.2 million in net tangible assets. Goodwill has been allocated to multiple reporting units based upon the fair value of projected earnings as of the date of the acquisition. The goodwill was allocated as follows: approximately $23.4 million to IDEXX VetLab, approximately $27.0 million to Reference Laboratories, approximately $11.1 million to Rapid Assay, and approximately $47.9 million to Veterinary Software Services. Goodwill related to this acquisition is expected to be deductible for tax purposes. Pro forma information has not been presented for this acquisition because such information is not material to the financial statements. The results of operations have been included in our CAG segment since the acquisition date. During the fourth quarter of 2021, we increased the contingent payable by $2.0 million, for a total expected payment of $7.0 million, which was subsequently paid during 2022. The increase to the contingent payment was expensed as the adjustment was made after the measurement period. The acquisition expenses were approximately $2.2 million. During the first quarter of 2021, we acquired the shares of a reference laboratory located in Switzerland for approximately $5.5 million in cash, including holdback and contingent payments of approximately $1.1 million. This acquisition expands our international reference laboratory presence and was accounted for as a business combination. The fair values of the assets acquired consist of approximately $4.3 million in intangible assets, primarily for customer relationships, which will be amortized over 9 years, approximately $1.8 million for goodwill, representing synergies within our broader CAG portfolio, and approximately $0.6 million of net liabilities, including deferred taxes associated with the acquired intangible assets. Goodwill related to this acquisition is not deductible for tax purposes. Pro forma information has not been presented for this acquisition because such information is not material to the financial statements. The results of operations have been included in our CAG segment since the acquisition date. The acquisition expenses were not material. Acquisition of noncontrolling interest During the fourth quarter of 2021, we acquired the remaining 5% interest of our sole foreign joint venture operation for approximately $1.0 million. As a result, we no longer record any minority interest in the equity section of our consolidated balance sheet. This transaction is recorded as an equity transaction, with no gain or loss reflected in the consolidated statements of income. Subsequent event On February 1, 2024, we acquired the assets of a privately-owned software and data platform business based in the U.S. that extends our practice management system cloud-native workflow and delivers strategic data solutions to our customers and their clients, for approximately $77 million in cash, and also agreed to make contingent payments of up to $30 million during the subsequent three years, based on the achievement of certain goals.

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
SHARE-BASED COMPENSATION	SHARE-BASED COMPENSATION We provide for various forms of share-based compensation awards to our employees and non-employee directors. Our share-based compensation plans allow for the issuance of a mix of stock options, restricted stock, stock appreciation rights, employee stock purchase rights, and other stock unit awards. With the exception of stock options, the fair value of our awards is equal to the closing stock price of IDEXX common stock on the date of grant. We calculate the fair value of our stock option awards using the Black-Scholes-Merton option-pricing model. For stock options, restricted stock units (“RSUs”), and deferred stock units (“DSUs”), share-based compensation expense is estimated based on awards ultimately expected to vest, reduced for estimated forfeitures, on a straight-line basis over the requisite service period of the award. For performance-based restricted stock units (“PBRSUs”), share-based compensation expense is estimated based on awards ultimately expected to vest, reduced for estimated forfeitures, on a graded vesting methodology over the requisite service period. Stock options permit a holder to buy IDEXX stock upon vesting at the stock option exercise price set on the day of grant. An RSU is an agreement to issue shares of IDEXX stock at the time of vesting. A PBRSU is an agreement to issue shares of IDEXX stock at the time of vesting upon successful completion of certain performance goals. DSUs are granted under our Executive Deferred Compensation Plan (the “Executive Plan”) and non-employee Director Deferred Compensation Plan (the “Director Plan”). DSUs may or may not have vesting conditions depending on the plan under which they are issued. We did not issue any restricted stock or stock appreciation rights during the years ended December 31, 2023, 2022, and 2021, nor were any restricted stock or stock appreciation rights outstanding as of those years then ended. We primarily issue shares of common stock to satisfy stock option exercises and employee stock purchase rights and to settle RSUs, PBRSUs, and DSUs. We issue shares of treasury stock to settle certain RSUs and upon the exercise of certain stock options, which were not material for the years ended December 31, 2023, 2022, and 2021. The number of shares of common stock and treasury stock issued are equivalent to the number of awards exercised or settled. With the exception of employee stock purchase rights, equity awards are issued to employees and non-employee di rectors under the 2018 Stock Incentive Plan (the “2018 Stock Plan”). Our Board of Directors has authorized the issuance of 7.5 million shar es of our common stock under the 2018 Stock Plan. Any shares that are subject to awards of stock options or stock appreciation rights will be counted against the share limit as one share for every share granted. Any shares that are issued other than stock options and stock appreciation rights will be counted against the share limit as 2.4 shares for every share granted. If any shares issued under our prior plans are forfeited, settled for cash, or expire, these shares, to the extent of such forfeiture, cash settlement, or expiration, will again be available for issuance under the 2018 Stock Plan. As of December 31, 2023, there were approximately 6.1 million remaining shares available for issuance under the 2018 Stock Plan. Share-Based Compensation Share-based compensation costs are classified in the consolidated financial statements consistent with the classification of cash compensation paid to the employees receiving such share-based compensation. The following is a summary of share-based compensation costs and related tax benefits recorded in our consolidated statements of income: (in thousands) For the Years Ended December 31, 2023 2022 2021 Share-based compensation expense included in cost of revenue $ 5,643 $ 4,638 $ 4,044 Share-based compensation expense included in operating expenses 54,096 45,132 33,711 Total share-based compensation expense included in consolidated statements of income 59,739 49,770 37,755 Income tax benefit resulting from share-based compensation expense (5,487) (4,658) (4,734) Net share-based compensation expense included in consolidated statements of income, excluding tax benefit from settlement of share-based awards 54,252 45,112 33,021 Income tax benefit resulting from settlement of share-based awards (13,703) (12,522) (32,474) Net expense related to share-based compensation arrangements included in consolidated statements of income $ 40,549 $ 32,590 $ 547 There were no material modifications to the terms of outstanding options, RSUs, PBRSUs, or DSUs during the years ended December 31, 2023, 2022, or 2021. Share-based compensation expense is reduced for an estimate of the number of awards that are expected to be forfeited. We use historical data and other factors to estimate expected employee terminations and to evaluate whether particular groups of employees have significantly different forfeiture expectations. Our share-based awards granted in certain years include a retirement provision for all employees based on age and length of service. These grants are subject to accelerated expensing if the holder meets the retirement definition set forth in the applicable equity and incentive plan document. The total unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards at December 31, 2023, was $60.2 million, which will be recognized over a weighted average period of approximately 1.3 years. Stock Options Prior to December 4, 2019, all options granted to employees primarily vest ratably over five years on each anniversary of the date of grant. Options granted to non-employee directors vest fully on the earlier of the first anniversary of grant or date of the following annual meeting. Employee grants after December 4, 2019 vest ratably over four years. Vesting of option awards issued is conditional upon continuous service, unless the employee retires under the retirement provision, for grants issued in 2018, 2019, 2022, and 2023, for which they will vest for two We use the Black-Scholes-Merton option-pricing model to determine the fair value of options granted. Option-pricing models require the input of highly subjective assumptions, particularly for the expected stock price volatility and the expected term of options. Changes in the subjective input assumptions can affect the fair value estimate. Our expected stock price volatility assumptions are based on the historical volatility of our stock over periods that are similar to the expected terms of grants and other relevant factors. We derive the expected term based on historical experience and other relevant factors concerning expected employee behavior with regard to option exercise. The risk-free interest rate is based on U.S. Treasury yields for a maturity approximating the expected term calculated at the date of grant. We have never paid cash dividends on our common stock and we have no intention to pay a dividend at this time; therefore, we assume that no dividends will be paid over the expected terms of option awards. We determine the assumptions used in the valuation of option awards as of the date of grant. Differences in the expected stock price volatility, expected term, or risk-free interest rate may necessitate distinct valuation assumptions at those grant dates. As such, we may use different assumptions for options granted throughout the year. The weighted averages of the valuation assumptions used to determine the fair value of each option award on the date of grant and the weighted average estimated fair values were as follows: For the Years Ended December 31, 2023 2022 2021 Expected stock price volatility 32 % 30 % 30 % Expected term, in years 6.7 6.4 6.2 Risk-free interest rate 3.7 % 2.1 % 0.7 % Weighted average fair value of options granted $ 201.48 $ 166.30 $ 169.15 A summary of the status of options granted under our share-based compensation plans at December 31, 2023, and changes during the year then ended, are presented in the table below: Number of Options (000) Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value ($000) Outstanding as of December 31, 2022 1,701 $ 219.90 Granted 142 $ 503.50 Exercised (215) $ 147.69 Forfeited (26) $ 432.43 Expired (6) $ 545.55 Outstanding as of December 31, 2023 1,596 $ 250.14 4.8 $ 487,487 Fully vested as of December 31, 2023 1,209 $ 186.45 3.9 $ 446,109 Fully vested and expected to vest as of December 31, 2023 (1) 1,581 $ 247.85 4.8 $ 486,636 (1) Includes options that are vested as of December 31, 2023, and outstanding options that are expected to vest in the future, net of estimated forfeitures. The total fair value of options vested were $22.5 million, $20.4 million, and $17.3 million during the years ended December 31, 2023, 2022, and 2021, respectively . Intrinsic value of stock options exercised represents the amount by which the market price of the common stock exceeded the exercise price before applicable income taxes. The total intrinsic values of stock options exercised were $75.5 million, $54.6 million, and $147.9 million during the years ended December 31, 2023, 2022, and 2021, respectively. Restricted Stock Units Prior to December 4, 2019, the majority of RSUs, including our PBRSUs, granted to employees vest ratably over five years on each anniversary of the date of grant. The majority of employee grants after December 4, 2019, vest ratably over four years. A minority of some employee grants cliff-vest three years from date of grant. PBRSUs granted to employees vest based on meeting performance goals set on the day of grant. Vesting as it relates to RSUs and PBRSUs issued is conditional upon continuous service, unless the employee retires under the retirement provision, for grants issued in 2018, 2019, 2022, and 2023, for which they will vest for two A summary of the status of RSUs and PBRSUs granted under our share-based compensation plans at December 31, 2023, and changes during the period then ended, are presented in the table below: Number of Units (000) Weighted Average Grant-Date Fair Value Nonvested as of December 31, 2022 148 $ 391.55 Granted 63 Vested (62) Forfeited (8) Nonvested as of December 31, 2023 141 $ 459.11 Expected to vest as of December 31, 2023 (1) 134 $ 457.51 (1) Outstanding units that are expected to vest in the future, net of estimated forfeitures. The total fair values of RSUs and PBRSUs vested were $31.1 million, $32.9 million, and $46.1 million during the years ended December 31, 2023, 2022, and 2021, respectively. The aggregate intrinsic value of nonvested RSUs and PBRSUs as of December 31, 2023, which is equal to the fair value of IDEXX’s common stock as of December 31, 2023, multiplied by the number of nonvested units as of December 31, 2023, was $78.0 million. Deferred Stock Units Under our Director Plan, non-employee directors may defer a portion of their cash fees in the form of vested DSUs. Prior to 2014, certain members of our management could elect to defer a portion of their cash compensation in the form of vested deferred stock units under our Executive Plan. Each DSU represents the right to receive one unissued share of our common stock. These recipients receive a number of DSUs equal to the amount of cash fees or compensation deferred divided by the closing sale price of the common stock on the date of deferral. Also under the Director Plan, non-employee directors are awarded annual grants of either RSUs or DSUs that vest fully on the earlier of the first anniversary of grant or date of the following annual meeting. Vesting for these annual RSU and DSU grants is conditional upon continuous service. Vested DSUs are distributed as shares of common stock on the distribution date elected by the participant and pursuant to the terms of the Director or Executive Plan, as applicable. There were approximately 59,000 and 58,000 vested DSUs outstanding under our share-based compensation plans as of December 31, 2023 and 2022, respectively. During 2023, approximately 300 DSUs were distributed as shares of common stock. Unvested DSUs as of December 31, 2023 and 2022, were not material. Employee Stock Purchase Rights Employee stock purchase rights are issued under the 1997 Employee Stock Purchase Plan, under which we reserved and may issue up to an aggregate of 4.7 million shares of common stock in periodic offerings. Under this plan, stock is sold to employees at a 15% discount off the closing price of the stock on the last day of each quarter. The dollar value of this discount is equal to the fair value of purchase rights recognized as share-based compensation. We issued approximately 36,300, 44,600, and 29,500 shares of common stock in connection with the Employee Stock Purchase Plan during the years ended December 31, 2023, 2022, and 2021, respectively. As of December 31, 2023, there were approximately 1.0 million remaining shares available for issuance under the 1997 Employee Stock Purchase Plan.

CREDIT LOSSES

CREDIT LOSSES	12 Months Ended
	Dec. 31, 2023
Credit Loss [Abstract]
CREDIT LOSSES	CREDIT LOSSES We are exposed to credit losses primarily through our sales of products and services to our customers. We maintain allowances for credit losses for potentially uncollectible receivables. We base our estimates on a detailed analysis of specific customer situations and a percentage of our accounts receivable by aging category. Additionally, our estimates are developed based on historical credit loss experience, estimates of recoveries, current economic conditions, and future expectations. Adjustments to historical loss information are made for differences in current economic conditions. Additional allowances may be required if either the financial condition of our customers was to deteriorate, or a strengthening U.S. dollar impacts the ability of foreign customers to make payments to us on their U.S. dollar-denominated purchases. We monitor our ongoing credit exposure through active review of counterparty balances against contract terms and due dates. Our activities include timely account reconciliations, dispute resolution, and payment confirmations. We may employ collection agencies and legal counsel to pursue recovery of defaulted receivables. Account balances are charged off against the allowance when we believe it is probable the receivable will not be recovered. We may require collateralized asset support or a prepayment to mitigate credit risk. We do not have any off-balance sheet credit exposure related to our customers. Accounts Receivable The allowance for credit losses associated with accounts receivable was $9.5 million and $8.3 million at December 31, 2023 and 2022, respectively. The amount of accounts receivable reflected on the balance sheet is net of this reserve. At December 31, 2023, approximately 83% of our accounts receivable had not yet reached the invoice due date and approximately 17% was considered past due, of which approximately 1.7% was greater than 60 days past due. At December 31, 2022, approximately 86% of our accounts receivable had not yet reached the invoice due date and approximately 14% was considered past due, of which approximately 2.0% was greater than 60 days past due. Write-offs and recoveries related to credit losses during the years ended December 31, 2023, 2022, and 2021 were not material. Contract assets and lease receivables The allowance for credit losses associated with contract assets and lease receivables was $6.4 million and $5.5 million at December 31, 2023 and 2022, respectively. The assets reflected on the balance sheet are net of these reserves. Historically, we have experienced low credit loss rates on our customer commitment programs and lease receivables. We apply judgment in determining the customer’s ability and intention to pay, which is based on a variety of factors including the customer’s historical payment experience or, in the case of a new customer, published credit and financial information pertaining to the customer. Write-offs and recoveries related to credit losses during the years ended December 31, 2023, 2022, and 2021 were not material.

INVENTORIES

INVENTORIES	12 Months Ended
	Dec. 31, 2023
Inventory, Net [Abstract]
INVENTORIES	INVENTORIES Inventories are stated at the lower of cost (first-in, first-out) or net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. We write down the carrying value of inventory for estimated obsolescence by an amount equal to the difference between the cost of inventory and the estimated market value when warranted based on assumptions of future demand, market conditions, remaining shelf life, or product functionality. If actual market conditions or results of estimated functionality are less favorable than those we estimated, additional inventory write-downs may be required, which would have a negative effect on results of operations. Unpaid inventory reflected within accounts payable in our consolidated balance sheets was $58.9 million, $59.4 million, and $64.4 million at December 31, 2023, 2022, and 2021, respectively. Instrument inventory transferred to property and equipment related to rental and operating-type reagent rental programs was $14.6 million, $17.4 million, $11.6 million during the years ended December 31, 2023, 2022, and 2021, respectively. The components of inventories are as follows: (in thousands) December 31, 2023 December 31, 2022 Raw materials $ 106,392 $ 92,796 Work-in-process 28,989 28,041 Finished goods 244,901 246,986 Inventories $ 380,282 $ 367,823

LEASES

LEASES	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
LEASES	LEASES The majority of our facilities are occupied under operating lease arrangements with various expiration dates through 2067, some of which include options to extend the life of the lease, and some of which include options to terminate the lease within one year. In certain instances, we are responsible for the real estate taxes and operating expenses related to these facilities. Additionally, we enter into operating leases for certain vehicles and equipment in the normal course of business. We determine the expected term of any executed agreements using the non-cancelable lease term plus any renewal options by which the failure to renew imposes a penalty in such amount that renewal is reasonably assured. The derived expected term is then used in the determination of a financing or operating lease and in the calculation of straight-line rent expense. Rent escalations are considered in the calculation of minimum lease payments in our capital lease tests and in determining straight-line rent expense for operating leases. Minimum lease payments include the fixed lease component of the agreement, as well as fixed rate increases that are initially measured at the lease commencement date. Variable lease payments based on an index and payments associated with non-lease components and short-term rentals (leases with terms less than twelve months) are expensed as incurred. Consideration is allocated to the lease and non-lease components based on the estimated standalone prices. We determine if an arrangement is a lease at its inception. Operating leases are included in operating lease right-of-use assets, accrued liabilities, and long-term operating lease liabilities in our consolidated balance sheets. Our financing leases are not material to the financial statements. Right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease liabilities and right-of-use assets are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an explicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Rent expense for lease payments is recognized on a straight-line basis over the lease term. The operating lease right-of-use assets also include any rent prepayments, lease incentives upon receipt, and straight-line rent expense impacts, which represent the differences between our operating lease liabilities and right-of-use assets. Maturities of operating lease liabilities are as follows: (in thousands) December 31, 2023 2024 $ 24,231 2025 23,478 2026 21,030 2027 16,138 2028 11,981 Thereafter 43,698 Total lease payments 140,556 Less imputed interest (21,083) Total lease liabilities (current and long-term) $ 119,473 Total minimum future lease payments for leases that have not commenced as of December 31, 2023, are not material. December 31, 2023 December 31, 2022 Weighted average remaining lease term - operating leases 8.9 years 9.7 years Weighted average discount rate - operating leases 4.0 % 3.5 % Expenses incurred related to operating leases, excluding variable and short-term leases, were approximately $29.1 million and $26.8 million during the years ended December 31, 2023 and 2022, respectively. Total expenses incurred related to operating leases, including variable rent and short-term leases, were approximately $31.7 million and $28.7 million for the years ended December 31, 2023 and 2022, respectively. Supplemental cash flow information for leases is as follows: For the Years Ended (in thousands) 2023 2022 Cash paid for amounts included in the measurement of operating lease liabilities $ 27,525 $ 24,973 Right-of-use assets obtained in exchange for operating lease obligations, net of early lease terminations $ 19,443 $ 36,817

PROPERTY AND EQUIPMENT, NET

PROPERTY AND EQUIPMENT, NET	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
PROPERTY AND EQUIPMENT, NET	PROPERTY AND EQUIPMENT, NET Property and equipment are stated at cost, net of accumulated depreciation and amortization. The costs of additions and improvements are capitalized, while maintenance and repairs are charged to expense as incurred. When an item is sold or retired, the cost and related accumulated depreciation are relieved, and the resulting gain or loss, if any, is recognized in the consolidated statements of income. We evaluate our property and equipment for impairment periodically or as changes in circumstances or the occurrence of events suggest the remaining value is not recoverable from future cash flows. If the carrying value of our property and equipment is impaired, an impairment charge is recorded for the amount by which the carrying value of the property and equipment exceeds its fair value. We provide for depreciation and amortization primarily using the straight-line method by charges to the consolidated statements of income in amounts that allocate the cost of property and equipment over their estimated useful lives as follows: Asset Classification Estimated Useful Life Buildings and improvements 10 to 40 years Leasehold improvements Shorter of remaining lease term or useful life of improvements Machinery and equipment 3 to 8 years Office furniture and equipment 3 to 7 years Computer hardware and software 3 to 7 years We capitalize interest on the acquisition and construction of significant assets that require a substantial period of time to be made ready for use. The capitalized interest is included in the cost of the completed asset and depreciated over the asset’s estimated useful life. The amount of interest capitalized during the years ended December 31, 2023 and 2022, was not material. We capitalize certain costs incurred in connection with developing or obtaining software designated for internal use based on three distinct stages of development. Qualifying costs incurred during the application development stage, which consist primarily of internal payroll and direct fringe benefits and external direct project costs, including labor and travel, are capitalized and amortized on a straight-line basis over the estimated useful life of the asset. Costs incurred during the preliminary project and post-implementation and operation phases are expensed as incurred. These costs relate primarily to the determination of performance requirements, data conversion, and training. Software developed to deliver hosted services to our customers has been designated as internal use. Property and equipment, net, consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Land and improvements $ 22,400 $ 22,221 Buildings and improvements 432,038 356,049 Leasehold improvements 116,347 107,251 Machinery and equipment 431,914 404,963 Office furniture and equipment 78,941 71,625 Computer hardware and software 326,295 295,969 Construction in progress 79,059 97,310 1,486,994 1,355,388 Less accumulated depreciation and amortization 784,817 705,914 Total property and equipment, net $ 702,177 $ 649,474 Below are the amounts of depreciation and amortization of property and equipment, capitalized computer software for internal use, unpaid property and equipment reflected in accounts payable and accrued expenses, and rental and reagent rental program instruments transferred from inventory to property and equipment: For the Years Ended December 31, (in thousands) 2023 2022 2021 Depreciation and amortization expense $ 100,994 $ 96,746 $ 92,376 Capitalization of internal-use software development costs during the period $ 37,120 $ 20,329 $ 14,753 Unpaid property and equipment, reflected in accounts payable and accrued liabilities at end of year $ 12,061 $ 18,334 $ 19,326 Rental and operating-type reagent rental program instruments transferred from inventory to property and equipment during the period (Note 3) $ 14,608 $ 17,407 $ 11,628

OTHER CURRENT AND LONG-TERM ASS

OTHER CURRENT AND LONG-TERM ASSETS	12 Months Ended
	Dec. 31, 2023
Other Assets, Noncurrent [Abstract]
OTHER CURRENT AND LONG-TERM ASSETS	OTHER CURRENT AND LONG-TERM ASSETS Other current assets consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Contract assets, net (1) $ 55,111 $ 41,854 Consideration paid to customers (2) 54,081 50,776 Prepaid expenses 48,370 41,742 Taxes receivable 16,972 48,430 Other 29,061 37,687 Other current assets $ 203,595 $ 220,489 (1) Contract assets, net, are net of allowances for credit losses. Refer to “Note 6. Credit Losses.” (2) Refer to “Note 3. Revenue, Up-Front Consideration Paid to Customers,” for more information regarding consideration paid to customers, previously referred to as customer acquisition costs. Other long-term assets consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Contract assets, net (1) $ 167,963 $ 148,971 Consideration paid to customers (2) 114,850 107,205 Deferred income taxes 107,364 55,215 Equity investments 30,250 30,250 Investment in long-term product supply arrangements 25,943 25,250 Other 50,164 50,838 Other long-term assets $ 496,534 $ 417,729 (1) Contract assets, net, are net of allowances for credit losses. Refer to “Note 6. Credit Losses.”

GOODWILL AND INTANGIBLE ASSETS,

GOODWILL AND INTANGIBLE ASSETS, NET	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS, NET	GOODWILL AND INTANGIBLE ASSETS, NET A significant portion of the purchase price for acquired businesses is generally assigned to intangible assets. Intangible assets other than goodwill are initially valued at fair value. If a quoted price in an active market for the identical asset is not readily available at the measurement date, the fair value of the intangible asset is estimated based on discounted cash flows using market participant assumptions, which are assumptions that are not specific to IDEXX. The selection of appropriate valuation methodologies and the estimation of discounted cash flows require significant assumptions about the timing and amounts of future cash flows, risks, appropriate discount rates, and the useful lives of intangible assets. When significant, we typically utilize independent valuation experts to advise and assist us in determining the fair values of the identified intangible assets acquired in connection with a business acquisition and in determining appropriate amortization methods and periods for those intangible assets. Goodwill is initially valued based on the excess of the purchase price of a business combination over the fair value of acquired net assets recognized and represents the future economic benefits arising from other assets acquired that could not be separately identified and recognized. Our business combinations regularly include contingent consideration arrangements that require additional consideration to be paid based on the achievement of established objectives, most commonly related to customer retention or revenue growth of the customer base during the post-combination period. We assess contingent consideration to determine if it should be recognized at its fair value on the acquisition date. A liability resulting from contingent consideration is remeasured to fair value at each reporting date until the contingency is resolved, with changes in fair value recognized in earnings if changes in estimates are made after the measurement period. Refer to “Note 18. Fair Value Measurements” for changes in the fair value of contingent consideration and differences arising upon settlements. We assess goodwill for impairment annually, at the reporting unit level in the fourth quarter, and whenever events or circumstances indicate impairment may exist. In evaluating goodwill for impairment, we have the option to first assess the qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the goodwill impairment test. The more likely than not threshold is defined as having a likelihood of more than 50%. If, after assessing the totality of events or circumstances, we determine that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, we assess the fair value of the reporting unit and compare its fair value to its carrying value to determine if the carrying value exceeds its fair value. Any excess of the carrying value of the goodwill above its fair value would be recognized as an impairment loss. In contrast, we can opt to bypass the qualitative assessment for any reporting unit in any period and proceed directly to assessing the fair value of the reporting unit(s), and compare the fair value of the reporting unit to its carrying value to determine if any impairment exists. Doing so does not preclude us from performing the qualitative assessment in any subsequent period. A prolonged economic downturn that results in lower long-term growth rates and reduced long-term profitability may reduce the fair value of our reporting units. Industry specific events or circumstances could have a negative impact on our reporting units and may also reduce the fair value of our reporting units. Should such events occur, and it becomes more likely than not that a reporting unit’s fair value has fallen below its carrying value, we will perform an interim goodwill impairment test, in addition to the annual impairment test. Future impairment tests may result in an impairment of goodwill. An impairment of goodwill would be reported as a non-cash charge to earnings. In the fourth quarter of 2023, we performed a qualitative assessment of goodwill impairment and concluded that there were no indications the carrying values of any of our reporting units exceeded their fair values. We had no goodwill impairments during the years ended December 31, 2023, 2022, or 2021. We assess the realizability of intangible assets other than goodwill whenever events or changes in circumstances indicate that the carrying value may not be recoverable. If an impairment review is triggered, we evaluate the carrying value of intangible assets, other than goodwill, based on estimated undiscounted future cash flows over the remaining useful life of the primary asset of the asset group and compare that value to the carrying value of the asset group. The asset group is the lowest level for which identifiable cash flows associated with the intangible asset are largely independent. The cash flows that are used contain our best estimates, using appropriate and customary assumptions and projections at the time. If the net carrying value of the asset group exceeds the related estimated undiscounted future cash flows, an impairment loss to adjust the intangible asset to its fair value would be reported as a non-cash charge to earnings. If necessary, we would calculate the fair value of an intangible asset using the present value of the estimated future cash flows to be generated by the intangible asset and apply a risk-adjusted discount rate. We had no impairments of our intangible assets during the years ended December 31, 2023, 2022, and 2021. The changes in the carrying amount of goodwill for the years ended December 31, 2023, 2022, and 2021, were as follows: (in thousands) CAG Water LPD Other Consolidated Total Balance as of December 31, 2020 $ 210,394 $ 12,023 $ 14,399 $ 6,531 $ 243,347 Business combinations 120,346 — — — 120,346 Impact of changes in foreign currency exchange rates (3,569) (84) (695) — (4,348) Balance as of December 31, 2021 $ 327,171 $ 11,939 $ 13,704 $ 6,531 $ 359,345 Business combinations 1,641 6,857 — — 8,498 Impact of changes in foreign currency exchange rates (5,330) (897) 179 — (6,048) Balance as of December 31, 2022 $ 323,482 $ 17,899 $ 13,883 $ 6,531 $ 361,795 Business combinations — — — — — Impact of changes in foreign currency exchange rates 2,740 321 1,105 — 4,166 Balance as of December 31, 2023 $ 326,222 $ 18,220 $ 14,988 $ 6,531 $ 365,961 Refer to “Note 4. Acquisitions, Asset Purchases and Investments” for information regarding goodwill and other intangible assets recognized in connection with the acquisition of businesses and other assets during the years ended December 31, 2023, 2022, and 2021. We provide for amortization primarily using the straight-line method by charges to income in amounts that allocate the intangible assets over their estimated useful lives as follows: Asset Classification Estimated Useful Life Customer-related intangible assets (1) 3 to 17 years Product rights (2) 5 to 15 years Noncompete agreements 3 to 5 years Intangible assets other than goodwill consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Cost Accumulated Amortization Net Cost Accumulated Amortization Net Customer-related intangible assets (1) $ 102,217 $ 37,782 $ 64,435 $ 104,111 $ 30,952 $ 73,159 Product rights (2) 27,317 8,606 18,711 30,176 8,039 22,137 Noncompete agreements 4,012 2,658 1,354 4,432 2,056 2,376 $ 133,546 $ 49,046 $ 84,500 $ 138,719 $ 41,047 $ 97,672 The above table excludes fully amortized intangible assets for the periods presented. (1) Customer-related intangible assets are comprised of customer lists and customer relationships acquired from third parties. (2) Product rights comprise certain technologies, intellectual property, licenses, and trade names acquired from third parties. Amortization expense of intangible assets other than goodwill was $13.8 million, $15.0 million, and $12.1 million for the years ended December 31, 2023, 2022, and 2021, respectively. At December 31, 2023, the aggregate amortization expense associated with intangible assets is estimated to be as follows for each of the next five years and thereafter: (in thousands) Amortization Expense 2024 $ 12,834 2025 12,097 2026 11,835 2027 10,522 2028 9,204 Thereafter 28,008 $ 84,500

ACCOUNTS PAYABLE, ACCRUED LIABI

ACCOUNTS PAYABLE, ACCRUED LIABILITIES AND OTHER LONG-TERM LIABILITIES	12 Months Ended
	Dec. 31, 2023
Accrued Liabilities, Current [Abstract]
ACCOUNTS PAYABLE, ACCRUED LIABILITIES AND OTHER LONG-TERM LIABILITIES	ACCOUNTS PAYABLE, ACCRUED LIABILITIES AND OTHER LONG-TERM LIABILITIES Accounts Payable - Supplier Financing Program We have an agreement with a third party to provide a supplier finance program, which facilitates participating suppliers’ ability to finance payment obligations from us with a designated third-party financial institution. Participating suppliers may, at their sole discretion, make offers to finance one or more of our payment obligations prior to their scheduled due dates at a discounted price. Our obligations to our suppliers, including amounts due and scheduled payment dates, are not impacted by suppliers’ decisions to finance amounts under these arrangements. The terms of payments are consistent with the terms of our trade payables. Activity related to the obligations is presented within operating activities on the consolidated statements of cash flows. The changes in our outstanding payment obligations under the supplier financing arrangement, which are included in accounts payable (in thousands) For the Years Ended December 31, 2023 2022 Payment obligations outstanding at the beginning of the period $ 10,171 $ 4,775 Payment obligation additions during the period 45,765 58,936 Payment obligations settled during the period (46,878) (53,540) Payment obligations outstanding at the end of the period $ 9,057 $ 10,171 Accrued liabilities consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Accrued employee compensation and related expenses $ 174,375 $ 142,994 Accrued expenses 113,596 149,446 Accrued taxes 86,553 48,547 Accrued customer incentives and refund obligations 84,386 72,250 Current lease liabilities 19,802 20,425 Accrued liabilities $ 478,712 $ 433,662 Other long-term liabilities consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Accrued taxes $ 39,642 $ 49,142 Other accrued long-term expenses 25,884 18,445 Other long-term liabilities $ 65,526 $ 67,587

DEBT

DEBT	12 Months Ended
	Dec. 31, 2023
Debt Instruments [Abstract]
DEBT	DEBT Credit Facility On October 20, 2022, we, along with IDEXX Distribution, Inc., IDEXX Operations, Inc., OPTI Medical Systems, Inc., IDEXX Laboratories Canada Corporation, IDEXX B.V., IDEXX Laboratories B.V., and IDEXX Laboratories GmbH, each a wholly-owned subsidiary (whether directly or indirectly held) (collectively, the “Borrowers”), together with the lenders party to that certain Existing Credit Agreement (as defined below), JPMorgan Chase Bank, N.A., as administrative agent (“Agent”), and the other parties thereto, entered into Amendment No. 1 (the “Amendment”), to that certain fourth amended and restated credit agreement, dated as of December 9, 2021, relating to a five-year unsecured revolving credit facility in the principal amount of $1.0 billion (the “Existing Credit Agreement,” and as amended by the Amendment, the “Credit Agreement”), among the Borrowers, the lenders, the Agent, JPMorgan Chase Bank, N.A., Toronto Branch, as Toronto agent, and the other parties thereto. The Amendment amended the Existing Credit Agreement to (i) provide for a borrowing by us effective October 20, 2022, of an incremental term loan in an aggregate principal amount of $250.0 million, (ii) convert all existing borrowings, which have interest rates determined by reference to a LIBOR-based interest rate, to borrowings determined by reference to a SOFR-based interest rate, (iii) provide for an option by us to obtain incremental borrowings under the Credit Agreement of term loans and/or revolving credit commitments of up to an aggregate principal amount of $250.0 million, which would represent an aggregate maximum of up to $1.5 billion, subject to the Borrowers obtaining commitments from existing or new lenders and satisfying other conditions specified in the Credit Agreement, and (iv) add certain implementing mechanics relating to the foregoing. On October 20, 2022, pursuant to the terms of the Credit Agreement, the term lenders thereunder provided us, as borrower, an incremental term loan in an aggregate principal amount of $250.0 million (the “Term Loan”). The Term Loan matures on October 20, 2025. The net proceeds of the Term Loan were used to repay previously incurred revolver borrowings under the Existing Credit Agreement. The Term Loan is subject to the same affirmative and negative covenants and events of default as the borrowings previously incurred pursuant to the Existing Credit Agreement. The applicable interest rate for the Term Loan is consistent with our line of credit, and is calculated at a per annum rate equal to either (at our option) (i) a prime rate plus a margin ranging from 0.0% to 0.375% based on our consolidated leverage ratio, (ii) an adjusted term SOFR rate, plus 0.10%, plus a margin ranging from 0.875% to 1.375% based on our consolidated leverage ratio, or (iii) an adjusted daily simple SOFR rate, plus 0.10%, plus a margin ranging from 0.875% to 1.375% based on our consolidated leverage ratio. Issuance costs for the incremental Term Loan were immaterial. In March 2023, we entered into an interest rate swap contract to manage the economic effects of $250.0 million of variable interest borrowings under our Credit Facility. Refer to” Note 19. Hedging Instruments” for a discussion of our derivative instruments and hedging activity. Although the revolving line of credit does not mature until December 9, 2026, and the Term Loan does not mature until October 20, 2025, all individual borrowings under the terms of the Credit Facility with an interest rate based on the prevailing Prime or SOFR rate (as selected by the Borrower) have a stated term between 1 and 180 days. At the end of each term, the obligation is either repaid or rolled over into a new borrowing or replaced by a borrowing based on a specific benchmark rate (where interest is then paid monthly). The Credit Facility contains a subjective material adverse event notification clause, which allows the debt holders to call the loans under the Credit Facility if we fail to provide prompt written notice to the syndicate of such an event. Based on the stated terms and the existence of the subjective material adverse event clause, this Credit Facility is reflected in the current liabilities section of our consolidated balance sheets. At December 31, 2023, we had $250.0 million outstanding on our line of credit, all of which is the $250.0 million Term Loan, with a weighted average effective interest rate of 6.0%, excluding any impact of our interest rate swap. Our weighted average borrowing rate for the year ended December 31, 2022, was 3.1%. At December 31, 2022, we had $579.0 million outstanding borrowings under our Credit Facility. The funds available under the Credit Facility reflect a further reduction due to the issuance of letters of credit, which were primarily issued in connection with our workers’ compensation policy, for $1.5 million in the years ended December 31, 2023 and 2022. The obligations under the Credit Facility may be accelerated upon the occurrence of an event of default under the Credit Facility, which includes customary events of default including payment defaults, defaults in the performance of the affirmative, negative and financial covenants, the inaccuracy of representations or warranties, bankruptcy and insolvency related defaults, defaults relating to judgments, certain events related to employee pension benefit plans under the Employee Retirement Income Security Act of 1974, the failure to pay specified indebtedness, cross-acceleration to specified indebtedness, and a change of control default. The Credit Facility contains affirmative, negative, and financial covenants customary for financings of this type. The negative covenants include restrictions on liens, indebtedness of subsidiaries of the Company, fundamental changes, investments, transactions with affiliates, and certain restrictive agreements. The sole financial covenant is a consolidated leverage ratio test that requires our ratio of debt to earnings before interest, taxes, depreciation, amortization, and share-based compensation, which is defined as the consolidated leverage ratio under the terms of the Credit Facility, not to exceed 3.5-to-1. At December 31, 2023, we were in compliance with the covenants of the Credit Facility. Senior Notes The following describes all of our currently outstanding unsecured senior notes issued and sold in private placements (collectively, the “Senior Notes”) as of December 31, 2023: (Principal Amount in thousands) Issue Date Due Date Series Principal Amount Coupon Rate Senior Note Agreement 12/11/2013 12/11/2025 2025 Series B Notes $ 75,000 4.04 % NY Life 2013 Note Agreement 9/4/2014 9/4/2026 2026 Senior Notes $ 75,000 3.72 % NY Life 2014 Note Agreement 7/21/2014 7/21/2024 2024 Series B Notes $ 75,000 3.76 % Prudential 2015 Amended Agreement 6/18/2015 6/18/2025 2025 Series C Notes € 88,857 1.785 % Prudential 2015 Amended Agreement 2/12/2015 2/12/2027 2027 Series B Notes $ 75,000 3.72 % MetLife 2014 Note Agreement 3/14/2019 3/14/2029 2029 Series C Notes $ 100,000 4.19 % MetLife 2014 Note Agreement 4/2/2020 4/2/2030 MetLife 2030 Series D Notes $ 125,000 2.50 % MetLife 2014 Note Agreement 4/14/2020 4/14/2030 Prudential 2030 Series D Notes $ 75,000 2.50 % Prudential 2015 Amended Agreement The following narrative describes our Senior Note activity: NY Life 2013 and 2014 Note Agreements, Including Amendments In December 2013, we issued and sold through a private placement an aggregate principal amount of $150.0 million of unsecured senior notes consisting of $75.0 million of 3.94% Series A Senior Notes due December 11, 2023 (the “2023 Series A Notes”) and $75.0 million of 4.04% Series B Senior Notes due December 11, 2025 (the “2025 Series B Notes”) under a Note Purchase Agreement among the Company, New York Life Insurance Company, and the accredited institutional purchasers named therein (as amended on April 10, 2020, the “NY Life 2013 Note Agreement”). In December 2023, we paid off our $75.0 million 2023 Series A Notes. In September 2014, we issued and sold through a private placement an aggregate principal amount of $75.0 million of unsecured 3.72% senior notes due September 4, 2026 (the “2026 Senior Notes”) under a Note Purchase Agreement dated as of July 22, 2014, among the Company, New York Life Insurance Company, and the accredited institutional purchasers named therein (as amended April 10, 2020, the “NY Life 2014 Note Agreement”). On April 10, 2020, we amended the NY Life 2013 Note Agreement and the NY Life 2014 Note Agreement by entering into two Amendments to Note Purchase Agreement with New York Life Insurance Company and the other parties thereto, which modified several defined terms, schedules and covenant baskets in the NY Life 2013 Agreement and the NY Life 2014 Note Agreement to create additional operating flexibility, and in particular to align such provisions with similar modifications we made substantially concurrently in our other debt facilities. Prudential 2015 Amended Agreement, Including Amendments In July 2014, we issued and sold through a private placement an aggregate principal amount of $125.0 million of unsecured senior notes consisting of $50.0 million of 3.32% Series A Senior Notes due July 21, 2021 (the “2021 Series A Notes”) and $75.0 million of 3.76% Series B Senior Notes due July 21, 2024 (the “2024 Series B Notes”) under a Note Purchase and Private Shelf Agreement among the Company, Prudential Investment Management, Inc. (“Prudential”), and the accredited institutional purchasers named therein (the “Prudential 2014 Note Agreement”). The $50.0 million 3.32% Series A Senior Note was repaid in full on the July 21, 2021 due date. In June 2015, we entered into an Amended and Restated Multi-Currency Note Purchase and Private Shelf Agreement (the “Original Prudential 2015 Amended Agreement”), among the Company, Prudential, and the accredited institutional purchasers named therein, which amends and restates the Prudential 2014 Note Agreement. Pursuant to the Original Prudential 2015 Amended Agreement, we issued and sold through an aggregated private placement an aggregate principal amount of €88.9 million of unsecured 1.785% Series C Senior Notes due June 18, 2025 (the “2025 Series C Notes”). On May 9, 2019, we entered into the Amendment to Note Purchase and Private Shelf Agreement (the “Prudential First Amendment”) with Prudential and the other parties thereto, which amended certain reporting provisions in the Original Prudential 2015 Amended Agreement. On April 10, 2020, we entered into the Second Amendment to the Prudential 2015 Amended Agreement (the “Prudential Second Amendment”), in order to (i) increase the facility size to $425.0 million, (ii) extend the facility issuance period to April 10, 2023, (iii) make various implementing and administrative changes in order to facilitate a $75.0 million notes issuance on April 14, 2020, (iv) allow the amount available to be issued under the facility to equal $425.0 million less the amount of notes outstanding from time to time during the issuance period, and (v) modify several defined terms, schedules and covenant baskets in the Original Prudential 2015 Amended Agreement, as amended by the Prudential First Amendment, to create additional operating flexibility, and in particular to align such provisions with similar modifications we made substantially concurrently in our other debt facilities. We refer to the Original Prudential 2015 Agreement, as amended by the Prudential First Amendment and the Prudential Second Amendment, as the “Prudential 2015 Amended Agreement.” On April 14, 2020, we issued and sold to Prudential and other purchasers $75.0 million of our unsecured senior notes (the “Prudential 2030 Series D Notes”) pursuant to the Prudential Second Amendment. The entire outstanding balance of the Prudential 2030 Series D Notes is due and payable on April 14, 2030, and the Prudential 2030 Series D Notes bear interest at the rate of 2.50% per annum. We used the proceeds received from the Prudential 2030 Series D Notes for general corporate purposes. MetLife 2014 Note Agreement, Including Amendments We entered into a Multicurrency Note Purchase and Private Shelf Agreement, dated as of December 19, 2014 (the “Original MetLife 2014 Note Agreement”), among the Company, Metropolitan Life Insurance Company (“MetLife”), and the accredited institutional purchasers named therein pursuant to which we agreed to issue and sell an aggregate principal amount of $150.0 million of unsecured senior notes consisting of $75.0 million of our 3.25% Series A Senior Notes having a seven-year term (the “2022 Series A Notes”), and $75.0 million of our 3.72% Series B Senior Notes having a twelve-year term (“2027 Series B Notes”). The issuance, sale and purchase of these notes occurred in February 2015. The aggregate principal amount of our 2022 Series A Notes for $75.0 million was paid on February 12, 2022. On March 14, 2019, we amended the Original MetLife 2014 Note Agreement. Pursuant to the Original MetLife 2014 Note Agreement, as so amended, we issued and sold through a private placement an aggregate principal amount of $100.0 million of unsecured senior notes at a 4.19% per annum rate, due March 14, 2029 (the “2029 Series C Notes”). On March 23, 2020, we entered into the Second Amendment to the Original MetLife 2014 Note Agreement (the “MetLife Second Amendment”), in order to (i) increase the facility size from $150.0 million to $300.0 million, (ii) extend the facility issuance period to December 20, 2022, (iii) make various implementing and administrative changes in order to facilitate a $125.0 million notes issuance on April 2, 2020, and (iv) allow the amount available to be issued under the facility to equal $300.0 million, less the amounts outstanding on 2029 Series C Notes and MetLife 2030 Series D Notes. On April 2, 2020, we issued and sold to MetLife and other purchasers $125.0 million of our unsecured senior notes (the “MetLife 2030 Series D Notes”) pursuant to the MetLife Second Amendment. The entire outstanding principal balance of the MetLife 2030 Series D Notes is due and payable on April 2, 2030, and the MetLife 2030 Series D Notes bear interest at the rate of 2.50% per annum. We used the proceeds received from the MetLife 2030 Series D Notes for general corporate purposes. We refer to the Original MetLife 2014 Agreement, as so amended, as the “MetLife 2014 Agreement,” and together with the NY Life 2013 Note Agreement, NY Life 2014 Note Agreement, and Prudential 2015 Amended Note Agreement, collectively, as the “Senior Note Agreements.” Senior Note Agreements The Senior Note Agreements contain affirmative, negative, and financial covenants customary for agreements of this type. The negative covenants include restrictions on liens, indebtedness of our subsidiaries, priority indebtedness, fundamental changes, investments, transactions with affiliates, certain restrictive agreements, and violations of laws and regulations. The sole financial covenant is a consolidated leverage ratio test that requires our ratio of debt to earnings before interest, taxes, depreciation, amortization, and share-based compensation, as defined in the Senior Note Agreements, not to exceed 3.5-to-1. At December 31, 2023, we were in compliance with the covenants of the Senior Note Agreements. Should we elect to prepay the Senior Notes, such aggregate prepayment will include the applicable make-whole amount(s), as defined within the applicable Senior Note Agreements. Additionally, in the event of a change in control of the Company or upon the disposition of certain assets of the Company the proceeds of which are not reinvested (as defined in the Senior Note Agreements), we may be required to prepay all or a portion of the Senior Notes. The obligations under the Senior Notes may be accelerated upon the occurrence of an event of default under the applicable Senior Note Agreement, each of which includes customary events of default including payment defaults, defaults in the performance of the affirmative, negative and financial covenants, the inaccuracy of representations or warranties, bankruptcy and insolvency related defaults, defaults relating to judgments, certain events related to employee pension benefit plans under the Employee Retirement Income Security Act of 1974, the failure to pay specified indebtedness, and cross-acceleration to specified indebtedness. We used the net proceeds from the issuances and sale of the Senior Notes for general corporate purposes. Future maturities of long-term debt at December 31, 2023, are as follows: (in thousands) Years Ending December 31, Amount 2024 $ 75,000 2025 173,187 2026 75,000 2027 75,000 2028 — Thereafter 300,000 $ 698,187 Total interest paid on all debt (including our Credit Facility) for the years ended December 31, 2023, 2022, and 2021, was $41.0 million, $40.3 million, and $30.5 million, respectively.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, deferred taxes represent the estimated future tax effects of temporary differences between book and tax treatment of assets and liabilities and carryforwards to the extent they are realizable. We record a valuation allowance to reduce our deferred tax assets to the amount that is more likely than not to be realized. In assessing the need for a valuation allowance, we consider future taxable income and ongoing prudent and feasible tax planning strategies. In the event that we determine that we would be able to realize our deferred tax assets in the future in excess of the net recorded amount, a reduction of the valuation allowance would increase income in the period such determination was made. Likewise, should we determine that we would not be able to realize all or part of our net deferred tax asset in the future, a reduction to the deferred tax asset would be charged to income in the period such determination was made. We record a liability for uncertain tax positions that do not meet the more likely than not standard as prescribed by the authoritative guidance for income tax accounting. We record tax benefits for only those positions that we believe will more likely than not be sustained. Unrecognized tax benefits are the differences between tax positions taken, or expected to be taken, in tax returns, and the benefits recognized for accounting purposes. We classify uncertain tax positions as long-term liabilities. Significant judgment is required in determining our worldwide provision for income taxes and our income tax filings are regularly under audit by tax authorities. Any audit result differing from amounts recorded would increase or decrease income in the period that we determine such adjustment is likely. Interest expense and penalties associated with the underpayment of income taxes are included in income tax expense. Earnings before income taxes were as follows: (in thousands) For the Years Ended December 31, 2023 2022 2021 Domestic $ 889,133 $ 684,661 $ 689,994 International 172,043 175,311 212,660 $ 1,061,176 $ 859,972 $ 902,654 The provision (benefit) for income taxes comprised the following: (in thousands) For the Years Ended December 31, 2023 2022 2021 Current Federal $ 191,274 $ 150,099 $ 112,811 State 40,369 30,529 19,147 International 32,797 35,138 29,288 264,440 215,766 161,246 Deferred Federal (36,501) (31,663) (7,019) State (6,462) (5,735) (503) International (5,343) 2,515 4,086 (48,306) (34,883) (3,436) $ 216,134 $ 180,883 $ 157,810 The provision for income taxes differs from the amounts computed by applying the statutory federal income tax rate as follows: For the Years Ended December 31, 2023 2022 2021 U.S. federal statutory rate 21.0 % 21.0 % 21.0 % State income tax, net of federal tax benefit 2.7 2.3 2.1 Taxation on international earnings (0.1) 0.6 (0.8) Foreign derived intangible income (1.4) (1.7) (1.2) Share-based compensation from settlements (1.3) (1.5) (3.6) Research and development credit (1.2) (1.1) (0.7) Other, net 0.7 1.4 0.7 Effective tax rate 20.4 % 21.0 % 17.5 % Our effective income tax rate was 20.4% for the year ended December 31, 2023, and 21.0% for the year ended December 31, 2022. Our effective tax rate for the year ended December 31, 2023, was lower primarily due to the release of valuation allowances against deferred tax assets in certain international and state jurisdictions where we determined, due to changes in circumstances during the current period, that it is more likely than not that we will realize the associated deferred tax assets. Income taxes paid, net of refunds received, for the periods ended December 31, 2023, 2022, and 2021, were $192.5 million, $239.8 million, and $161.7 million, respectively. Prior to January 1, 2022, we received benefits from a tax ruling in the Netherlands that documented our mutual understanding of how prior tax laws applied to our circumstances. Primarily as a result of this tax ruling, our net income was higher by $21.4 million for the year ended December 31, 2021. The benefits from these tax rulings are reflected within the overall benefits received from taxation on international earnings during 2021 in the table above. On December 31, 2021, the Netherlands adopted legislation eliminating the tax benefits related to this tax ruling for tax years beginning after December 31, 2021. The year ending December 31, 2021 was the final year that tax benefits were received as a benefit from the tax ruling. We have determined that unremitted earnings are not indefinitely reinvested to the extent they can be distributed without incurring a significant tax liability. As such, we have recorded a deferred tax liability for foreign withholding tax that will be incurred with respect to the unremitted earnings upon repatriation. We consider all other outside basis differences to be indefinitely reinvested to the extent reversal would incur a significant tax liability. It is not practicable to calculate a deferred tax liability related to such outside basis differences. The components of the net deferred tax assets (liabilities) included in the accompanying consolidated balance sheets are as follows: (in thousands) December 31, 2023 December 31, 2022 Assets Accrued expenses $ 44,043 $ 38,457 Accounts receivable reserves 2,700 2,447 Deferred revenue 6,427 4,671 Inventory basis differences 24,500 9,062 Property-based differences 18,036 20,157 Intangible asset basis differences 47,089 44,196 Share-based compensation 12,061 11,324 Other 2,267 1,273 Net operating loss carryforwards 9,007 8,956 Tax credit carryforwards 12,824 13,370 Unrealized losses on foreign currency exchange contracts and investments 821 227 Research and development expenditure differences 66,705 29,997 Total assets 246,480 184,137 Valuation allowance (34,793) (39,726) Total assets, net of valuation allowance 211,687 144,411 Liabilities Customer acquisition costs (39,318) (37,223) Property-based differences (52,235) (44,295) Intangible asset basis differences (6,335) (2,379) Other (11,639) (8,958) Unrealized gains on foreign currency exchange contracts and investments (1,813) (4,491) Total liabilities (111,340) (97,346) Net deferred tax assets $ 100,347 $ 47,065 As of December 31, 2023, we recorded valuation allowances against certain deferred tax assets related to temporary differences, including intangible asset basis differences and net operating loss (“NOL”) and tax credit carryforwards, as it is more likely than not that they will not be realized or utilized within the carryforward period. The following table summarizes the changes in valuation allowance for deferred tax assets: (in thousands) For the Years Ended December 31, 2023 2022 2021 Balance at beginning of year $ 39,726 $ 39,280 $ 40,262 Charges to costs and expense 21 2,200 1,464 Write-off/cash payments (7,846) (1,537) (1,182) Foreign currency translation 2,892 (217) (1,264) Balance at the end of the year $ 34,793 $ 39,726 $ 39,280 As of December 31, 2023, we have NOLs in certain state and international jurisdictions of approximately $39.3 million available to offset future taxable income. Most of these NOLs will expire at various dates between 2024 and 2030 and the remainder have indefinite lives. The following table summarizes the changes in unrecognized tax positions: (in thousands) For the Years Ended December 31, 2023 2022 2021 Total amounts of unrecognized tax benefits, beginning of period $ 22,547 $ 21,789 $ 22,484 Gross increases in unrecognized tax positions as a result of tax positions taken during a prior period 6,366 342 443 Gross increases in unrecognized tax positions as a result of tax positions taken in the current period 3,987 3,197 2,414 Decreases in unrecognized tax positions related to settlements with taxing authorities (7,535) (1,544) (537) Decreases in unrecognized tax positions as a result of a lapse of the applicable statutes of limitations (3,045) (1,237) (3,015) Total amounts of unrecognized tax benefits, end of period $ 22,320 $ 22,547 $ 21,789 Of the total unrecognized tax benefits at December 31, 2023 and 2022, $21.2 million and $20.9 million, respectively, comprise unrecognized tax positions that would, if recognized, affect our effective tax rate. Unrecognized tax benefits of approximately $8.9 million are subject to the lapse in the statutes of limitations during 2024 in various U.S. and international tax jurisdictions. During the years ended December 31, 2023, 2022, and 2021, we recorded interest expense and penalties related to income taxes, of $2.9 million, $1.3 million, and $1.1 million, respectively, as income tax expense in our consolidated statement of income. At December 31, 2023, 2022, and 2021, we had $3.8 million, $4.2 million, and $3.8 million, respectively, of estimated interest expense and penalties accrued in our consolidated balance sheets. In the ordinary course of our business, our income tax filings are regularly under audit by tax authorities. While we believe we have appropriately provided for all uncertain tax positions, amounts asserted by taxing authorities could be greater or less than our accrued position. Accordingly, additional provisions on income tax matters, or reductions of previously accrued provisions, could be recorded in the future as we revise our estimates due to changing facts and circumstances or the underlying matters are settled or otherwise resolved. We are currently under tax examinations in various jurisdictions. We anticipate that these examinations will be concluded within the next two years. With few exceptions, we are no longer subject to income tax examinations for years before 2015 in any jurisdiction in which we conduct significant taxable activities.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic earnings per share is computed by dividing net income attributable to our stockholders by the weighted average number of shares of common stock and vested deferred stock units outstanding during the year. The computation of diluted earnings per share is similar to the computation of basic earnings per share, except that the denominator is increased for the assumed exercise of dilutive options and assumed issuance of unvested restricted stock units and unvested deferred stock units using the treasury stock method unless the effect is anti-dilutive. The treasury stock method assumes that proceeds, including cash received from the exercise of employee stock options and the total unrecognized compensation expense for unvested share-based compensation awards, would be used to purchase our common stock at the average market price during the period. Vested deferred stock units outstanding are included in shares outstanding for basic and diluted earnings per share because the associated shares of our common stock are issuable for no cash consideration, the number of shares of our common stock to be issued is fixed, and issuance is not contingent. Refer to “Note 5. Share-Based Compensation” for additional information regarding deferred stock units. The following is a reconciliation of weighted average shares outstanding for basic and diluted earnings per share: (in thousands) For the Years Ended December 31, 2023 2022 2021 Shares outstanding for basic earnings per share: 83,066 83,623 85,200 Shares outstanding for diluted earnings per share: Shares outstanding for basic earnings per share 83,066 83,623 85,200 Dilutive effect of share-based payment awards 912 977 1,372 83,978 84,600 86,572 Certain awards and options to acquire shares have been excluded from the calculation of shares outstanding for diluted earnings per share because they were anti-dilutive. The following table presents information concerning those anti-dilutive awards and options: (in thousands) For the Years Ended December 31, 2023 2022 2021 Weighted average number of shares underlying anti-dilutive options 381 263 121 Weighted average number of shares underlying anti-dilutive awards 1 46 —

COMMITMENTS, CONTINGENCIES AND

COMMITMENTS, CONTINGENCIES AND GUARANTEES	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS, CONTINGENCIES AND GUARANTEES	COMMITMENTS, CONTINGENCIES AND GUARANTEES Commitments Refer to “Note 8. Leases” for more information regarding our lease commitments. In the ordinary course of business we enter into purchase obligations that include agreements and purchase orders to purchase goods or services that are contractually enforceable and that specify all significant terms, including fixed or minimum quantities, pricing, and approximate timing of purchases. As of December 31, 2023, we had approximately $196.3 million in purchase obligations due in 2024. Our purchase obligations beyond 2024 are approximately $55.2 million. The expected timing of payments of our purchase obligations is estimated based on current information. Timing of payments and actual amounts paid may be different, depending on the time of receipt of goods or services, or changes to agreed-upon amounts for some obligations. Contingencies We are subject to claims that may arise in the ordinary course of business, including with respect to actual and threatened litigation and other matters. We accrue for loss contingencies when it is probable that future expenditures will be made, and such expenditures can be reasonably estimated. However, the results of legal actions cannot be predicted with certainty, and therefore our actual losses with respect to these contingencies could exceed our accruals. Except for the litigation matter described below, at December 31, 2023, our accruals with respect to actual and threatened litigation were not material. We are a defendant in an ongoing litigation matter involving an alleged breach of contract for underpayment of royalty payments made from 2004 through 2017 under an expired patent license agreement. The plaintiff has asserted a claim of approximately $50 million inclusive of interest through June 30, 2020, alleging that the incorrect royalty provision was applied to certain licensed products and services throughout the agreement term and that royalties were also due on non-licensed diagnostic services that were provided concurrently with licensed services. The trial court previously ruled in favor of the plaintiff in this matter. The appellate court reversed the trial court’s decision, and the state supreme court granted the plaintiff’s petition for review. The state supreme court held a hearing to review the appellate court decision in January 2024, and a ruling is pending. While we believe the claim is without merit and will continue to vigorously defend ourselves against the plaintiff’s allegations, litigation is inherently unpredictable, and there can be no assurance that we will prevail in this matter. During the third quarter of 2020, we established an accrual of $27.5 million related to this ongoing matter, which represents the amount of the contingent loss that we have determined to be probable and estimable. We have not made any adjustments to this accrual since it was established. The actual cost of resolving this matter may be higher or lower than the amount we have accrued. From time to time, we have received notices alleging that our products infringe third-party proprietary rights, although we are not aware of any pending litigation with respect to such claims. Patent litigation frequently is complex and expensive, and the outcome of patent litigation can be difficult to predict. There can be no assurance that we will prevail in any infringement proceedings that may be commenced against us. If we lose any such litigation, we may be stopped from selling certain products and/or we may be required to pay damages as a result of the litigation. Guarantees We enter into agreements with third parties in the ordinary course of business under which we are obligated to indemnify such third parties for and against various risks and losses. The precise terms of such indemnities vary with the nature of the agreement. In many cases, we limit the maximum amount of our indemnification obligations, but in some cases, those obligations may be theoretically unlimited. We have not incurred material expenses in discharging any of these indemnification obligations and, based on our analysis of the nature of the risks involved, we believe that the fair value of potential indemnification under these agreements is minimal. Accordingly, we have recorded no liabilities for these obligations at December 31, 2023 and 2022. When acquiring a business, we sometimes assume liability for certain events or occurrences that took place prior to the date of acquisition. As of December 31, 2023 and 2022, we do not have any material pre-acquisition liabilities recorded.

SEGMENT REPORTING

SEGMENT REPORTING	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
SEGMENT REPORTING	SEGMENT REPORTING We operate primarily through three business segments: Companion Animal Group (“CAG”), Water quality products (“Water”), and Livestock, Poultry and Dairy (“LPD”). CAG provides products and services for veterinarians and the biomedical research community, primarily related to diagnostics and information management. Water provides innovative testing solutions for the detection and quantification of various microbiological parameters in water. LPD provides diagnostic tests, services, and related instrumentation that are used to manage the health status of livestock and poultry, to improve producer efficiency, and to ensure the quality and safety of milk. Our Other operating segment combines and presents our human medical diagnostic business (“OPTI Medical”) with our out-licensing arrangements because they do not meet the quantitative or qualitative thresholds for reportable segments. OPTI Medical develops, manufactures, and distributes human medical diagnostic products and services. Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision-maker (“CODM”), or decision-making group, in deciding how to allocate resources and in assessing performance. Our CODM is our Chief Executive Officer. Our reportable segments include: CAG, Water, LPD, and Other. Assets are not allocated to segments for internal reporting purposes. Intersegment revenues, which are not included in the table below, were not material for the years ended December 31, 2023, 2022, and 2021. The following is a summary of segment performance: (in thousands) For the Years Ended December 31, CAG Water LPD Other Consolidated Total 2023 Revenue $ 3,352,356 $ 168,149 $ 121,659 $ 18,789 $ 3,660,953 Income from operations $ 1,012,740 $ 74,340 $ 9,975 $ 73 $ 1,097,128 Interest expense, net (35,952) Income before provision for income taxes 1,061,176 Provision for income taxes 216,134 Net income 845,042 Less: Net income attributable to noncontrolling interest — Net income attributable to IDEXX Laboratories, Inc. stockholders $ 845,042 Depreciation and amortization $ 103,554 $ 4,117 $ 3,657 $ 3,580 $ 114,908 2022 Revenue $ 3,058,793 $ 155,720 $ 122,607 $ 30,204 $ 3,367,324 Income from operations $ 800,949 $ 72,519 $ 19,809 $ 5,488 $ 898,765 Interest expense, net (38,793) Income before provision for income taxes 859,972 Provision for income taxes 180,883 Net income 679,089 Less: Net income attributable to noncontrolling interest — Net income attributable to IDEXX Laboratories, Inc. stockholders $ 679,089 Depreciation and amortization $ 101,254 $ 3,020 $ 3,797 $ 3,829 $ 111,900 2021 Revenue $ 2,889,960 $ 146,505 $ 135,887 $ 43,008 $ 3,215,360 Income from operations $ 824,022 $ 65,444 $ 28,636 $ 13,926 $ 932,028 Interest expense, net (29,374) Income before provision for income taxes 902,654 Provision for income taxes 157,810 Net income 744,844 Less: Net income attributable to noncontrolling interest (1) Net income attributable to IDEXX Laboratories, Inc. stockholders $ 744,845 Depreciation and amortization $ 94,202 $ 2,709 $ 3,908 $ 3,777 $ 104,596 Refer to “Note 3. Revenue” for a summary of disaggregated revenue by reportable segment and by major product and service category for the years ended December 31, 2023, 2022, and 2021. Net long-lived assets, consisting of net property and equipment, are subject to geographic risks because they are generally difficult to move and to effectively utilize in another geographic area in a reasonable time period and because they are relatively illiquid. Net long-lived assets by principal geographic areas were as follows: (in thousands) December 31, 2023 December 31, 2022 Americas United States $ 531,735 $ 486,690 Brazil 33,236 25,949 Canada 7,032 7,407 572,003 520,046 Europe, the Middle East and Africa Germany 56,115 55,726 United Kingdom 10,900 10,710 Netherlands 10,604 11,975 France 1,724 1,507 Switzerland 14,129 13,445 Other 2,907 3,054 96,379 96,417 Asia Pacific Region Japan 4,892 5,111 Australia 21,922 20,243 Other 6,981 7,657 33,795 33,011 Total $ 702,177 $ 649,474

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS U.S. GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. U.S. GAAP requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. We have certain financial assets and liabilities that are measured at fair value on a recurring basis, certain nonfinancial assets and liabilities that may be measured at fair value on a non-recurring basis, and certain financial assets and liabilities that are not measured at fair value in our consolidated balance sheets but for which we disclose the fair value. The fair value disclosures of these assets and liabilities are based on a three-level hierarchy, which is defined as follows: Level 1 Quoted prices in active markets for identical assets or liabilities that the entity can access at the measurement date. Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. We did not have any transfers between Level 1 and Level 2, or transfers in or out of Level 3, of the fair value hierarchy during the years ended December 31, 2023 and 2022. Our cross currency swap contracts are measured at fair value on a recurring basis in our accompanying consolidated balance sheets and are classified as derivative instruments. We measure the fair value of our cross currency swap contracts using prevailing market conditions as of the close of business on each balance sheet date. The product of this calculation is then adjusted for counterparty risk. Our foreign currency exchange contracts are measured at fair value on a recurring basis in our accompanying consolidated balance sheets and are classified as derivative instruments. We measure the fair value of our foreign currency exchange contracts using an income approach, based on prevailing market forward rates less the contract rate multiplied by the notional amount. The product of this calculation is then adjusted for counterparty risk. Our interest rate swap contract is measured at fair value on a recurring basis in our accompanying consolidated balance sheets and is classified as a derivative instrument. We measure the fair value of our interest rate swap using current market interest rates for debt issues with similar remaining years to maturity, adjusted for applicable credit risk. The amounts outstanding under our unsecured revolving credit facility (“Credit Facility” or “line of credit”) and senior notes (“long-term debt”) are measured at carrying value in our accompanying consolidated balance sheets though we disclose the fair value of these financial instruments. We determine the fair value of the amount outstanding under our Credit Facility and long-term debt using an income approach, utilizing a discounted cash flow analysis based on current market interest rates for debt issues with similar remaining years to maturity, adjusted for applicable credit risk. Our Credit Facility and long-term debt are valued using Level 2 inputs. The estimated fair value of our Credit Facility approximates its carrying value. At December 31, 2023, the estimated fair value and carrying value of our long-term debt were $670.0 million and $698.2 million, respectively. At December 31, 2022, the estimated fair value and carrying value of our long-term debt were $725.6 million and $769.8 million, respectively. The following tables set forth our assets and liabilities that were measured at fair value on a recurring basis by level within the fair value hierarchy: (in thousands) As of December 31, 2023 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Balance at December 31, 2023 Assets Money market funds (1) $ 290,807 $ — $ — $ 290,807 Equity mutual funds (2) $ 99 $ — $ — $ 99 Cross currency swaps (3) $ — $ 664 $ — $ 664 Foreign currency exchange contracts (3) $ — $ 1,783 $ — $ 1,783 Interest rate swap (4) $ — $ 1,451 $ — $ 1,451 Liabilities Cross currency swaps (3) $ — $ 5,041 $ — $ 5,041 Foreign currency exchange contracts (3) $ — $ 5,532 $ — $ 5,532 Deferred compensation (5) $ 99 $ — $ — $ 99 (in thousands) As of December 31, 2022 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Balance at December 31, 2022 Assets Equity mutual funds (2) $ 385 $ — $ — $ 385 Cross currency swaps (3) $ — $ 9,262 $ — $ 9,262 Foreign currency exchange contracts (3) $ — $ 5,185 $ — $ 5,185 Liabilities Foreign currency exchange contracts (3) $ — $ 4,572 $ — $ 4,572 Deferred compensation (5) $ 385 $ — $ — $ 385 Contingent payments - acquisitions $ — $ — $ 120 $ 120 (1) Money market funds with an original maturity of less than ninety days are included within cash and cash equivalents. The remaining balance of cash and cash equivalents as of December 31, 2023, consisted of demand deposits. (2) Equity mutual funds relate to a deferred compensation plan that was assumed as part of a previous business combination. This amount is included within other current assets. Refer to footnote (5) below for a discussion of the related deferred compensation liability. (3) Cross currency swaps and foreign currency exchange contracts are included within other current assets; other long-term assets; accrued liabilities; or other long-term liabilities depending on the gain (loss) position and anticipated settlement date. (4) The interest rate swap is included within other long-term assets. (5) A deferred compensation plan assumed as part of a previous business combination is included within accrued liabilities. The fair value of our deferred compensation plan is indexed to the performance of the underlying equity mutual funds discussed in footnote (2) above. The estimated fair values of certain financial instruments, including cash and cash equivalents, accounts receivable, and accounts payable, approximate carrying value due to their short maturity. Contingent Consideration We have classified our liabilities for contingent consideration related to acquisitions within Level 3 of the fair value hierarchy because the fair value is determined using significant unobservable inputs, which includes the achievements of future revenues. The contingent consideration is included within other short-term liabilities. We record changes in the estimated fair value of contingent consideration in the consolidated statements of income. Changes in contingent consideration liabilities are measured at fair value on a recurring basis using unobservable inputs (Level 3) and during the years ended December 31, 2023, and 2022, are as follows: (in thousands) Fair Value Contingent consideration as of December 31, 2021 $ 7,230 Payment of contingent consideration (7,110) Change in estimated fair value — Contingent consideration as of December 31, 2022 120 Payment of contingent consideration (99) Change in estimated fair value (21) Contingent consideration as of December 31, 2023 $ — During the second quarter of 2022, we determined that the $7.0 million contingent consideration associated with our ezyVet acquisition in the second quarter of 2021 would be earned based on revenue achievements obtained. This amount was paid out during the second and third quarters of 2022. During the third quarter of 2022, we also issued a contingent payment related to a separate acquisition for approximately $0.1 million.

HEDGING INSTRUMENTS

HEDGING INSTRUMENTS	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
HEDGING INSTRUMENTS	HEDGING INSTRUMENTS Disclosure within this note is presented to provide transparency about how and why we use derivative and non-derivative instruments (collectively “hedging instruments”), how the instruments and related hedged items are accounted for, and how the instruments and related hedged items affect our financial position, results of operations, and cash flows. We are exposed to certain risks related to our ongoing business operations. We utilize hedging instruments to manage a portion of our foreign currency exchange risk and interest rate risk. During the first quarter of 2023, we entered into an interest rate swap to manage the impact of interest rate fluctuations associated with $250.0 million of borrowings under our variable-rate Credit Facility. We have designated the interest rate swap as a cash flow hedge. Our subsidiaries enter into foreign currency exchange contracts to manage the exchange risk associated with their forecasted intercompany inventory purchases and sales for the next year. From time to time, we may also enter into other foreign currency exchange contracts, cross currency swaps, or foreign-denominated debt issuances to minimize the impact of foreign currency fluctuations associated with specific balance sheet exposures, including net investments in certain foreign subsidiaries. The primary purpose of our foreign currency hedging activities is to protect against the volatility associated with foreign currency transactions, including transactions denominated in euro, British pound, Japanese yen, Canadian dollar, and Australian dollar. We also utilize natural hedges to mitigate our transaction and commitment exposures. Our corporate policy prescribes the range of allowable hedging activity. We enter into foreign currency exchange contracts with large, well-capitalized multinational financial institutions and we do not hold or engage in transactions involving derivative instruments for purposes other than risk management. Our accounting policies for these contracts are based on our designation of such instruments as hedging transactions. We recognize all hedging instrument assets and liabilities on the balance sheet at fair value at the balance sheet date. Instruments that do not qualify for hedge accounting treatment must be recorded at fair value through earnings. To qualify for hedge accounting treatment, cash flow and net investment hedges must be highly effective in offsetting changes to expected future cash flows or fair value on hedged transactions. If the instrument qualifies for hedge accounting, changes in the fair value of the hedging instrument from the effective portion of the hedge are deferred in AOCI, net of tax, and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. We immediately record in earnings the extent to which a hedging instrument is not effective in achieving offsetting changes in fair value. We de-designate hedging instruments from hedge accounting when the likelihood of the hedged transaction occurring becomes less than probable. For de-designated instruments, the gain or loss from the time of de-designation through maturity of the instrument is recognized in earnings. Any gain or loss in AOCI at the time of de-designation is reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Refer to “Note 21. Accumulated Other Comprehensive Income” for further information regarding the effect of hedging instruments on the consolidated statements of income for the years ended December 31, 2023, 2022, and 2021. We enter into master netting arrangements with the counterparties to our derivative transactions which permit certain outstanding receivables and payables to be offset in the event of default. Our derivative contracts do not require either party to post cash collateral. We elect to present our derivative assets and liabilities in the accompanying consolidated balance sheets on a gross basis. All cash flows related to our foreign currency exchange contracts are classified as operating cash flows, which is consistent with the cash flow treatment of the underlying items being hedged. Refer to “Note 18. Fair Value Measurements” for additional information regarding the fair value of our derivative instruments and “Note 21. Accumulated Other Comprehensive Income” for additional information regarding the effect of derivative instruments designated as cash flow hedges on the consolidated statements of income. Cash Flow Hedges We have designated our foreign currency exchange contracts and our interest rate swap as cash flow hedges as these derivative instruments manage our exposure to variability in the cash flows of forecasted transactions attributable to foreign currency exchange and to interest rates on variable interest obligations under the terms of our Credit Facility. Unless noted otherwise, we have also designated our derivative instruments as qualifying for hedge accounting treatment. We did not de-designate any instruments from hedge accounting treatment during the years ended December 31, 2023, 2022, and 2021. Gains and losses related to hedge ineffectiveness recognized in earnings during the years ended December 31, 2023, 2022, and 2021 were not material. At December 31, 2023, the estimated amount of losses, net of tax, from our foreign exchange contracts which are expected to be reclassified out of AOCI and into earnings within the next twelve months is $2.4 million if exchange rates do not fluctuate from the levels at December 31, 2023. At December 31, 2023, the estimated amount of gains, net of tax, from our interest rate swap contract which are expected to be reclassified out of AOCI and into earnings within the next twelve months is $1.7 million if interest rates do not fluctuate from the levels as of December 31, 2023. Foreign Currency Exchange Contracts: We target to hedge approximately 75% to 85% of the estimated exposure from intercompany product purchases and sales denominated in the euro, British pound, Canadian dollar, Japanese yen, and Australian dollar. We have additional unhedged foreign currency exposures related to intercompany foreign transactions and emerging markets where it is not practical to hedge. We primarily utilize foreign currency exchange contracts with durations of less than 24 months. Quarterly, we enter into contracts to hedge incremental portions of anticipated foreign currency transactions for the current and following year. As a result, our risk with respect to foreign currency exchange rate fluctuations and the notional value of foreign currency exchange contracts may vary throughout the year. The U.S. dollar is the currency purchased or sold in all of our foreign currency exchange contracts. The notional amount of foreign currency exchange contracts to hedge forecasted intercompany inventory purchases and sales totaled $294.0 million and $258.2 million at December 31, 2023 and 2022, respectively. Interest Rate Swap: We entered into an interest rate swap contract to manage the economic effect of variable interest obligations on amounts borrowed under the terms of the Credit Facility. Beginning on March 31, 2023, the variable interest rate associated with $250.0 million of borrowings outstanding under the Credit Facility became effectively fixed at 3.9% plus the applicable credit spread, through October 20, 2025. The following table presents the effect of cash flow hedge accounting on our consolidated statements of income and comprehensive income, and provides information regarding the location and amounts of pretax gains or losses of derivatives: (in thousands) Years Ended December 31, 2023 2022 2021 Financial statement line items in which effects of cash flow hedges are recorded Cost of revenue $ 1,470,983 $ 1,362,986 $ 1,325,928 Foreign exchange contracts Amount of gain (loss) reclassified from accumulated other comprehensive income into income $ 3,512 $ 25,733 $ (7,121) Financial statement line items in which effects of cash flow hedges are recorded Interest expense $ (41,581) $ (39,858) $ (29,808) Interest rate swap contract Amount of gain reclassified from accumulated other comprehensive income into net income $ 2,656 $ — $ — Net Investment Hedges, Euro-Denominated Notes In June 2015, we issued and sold through a private placement an aggregate principal amount of €88.9 million in euro-denominated 1.785% Series C Senior Notes due June 18, 2025. We have designated these euro-denominated notes as a hedge of our euro net investment in certain foreign subsidiaries to reduce the volatility in stockholders’ equity caused by changes in foreign currency exchange rates in the euro relative to the U.S. dollar. As a result of this designation, gains and losses from the change in translated U.S. dollar value of these euro-denominated notes are recorded in AOCI rather than to earnings. We recorded a loss of $2.6 million, a gain of $4.5 million, and a gain of $6.4 million, net of tax, within AOCI as a result of this net investment hedge for the years ended December 31, 2023, 2022, and 2021, respectively. The related cumulative unrealized gain recorded at December 31, 2023, will not be reclassified in earnings until the complete or substantially complete liquidation of the net investment in the hedged foreign operations or all or a portion of the hedge no longer qualifies for hedge accounting treatment. Refer to “Note 13. Debt” to the consolidated financial statements included in this Annual Report on Form 10-K for further information regarding the issuance of these euro-denominated notes. Net Investment Hedges, Cross Currency Swaps We have entered into several cross currency swap contracts as a hedge of our net investment in foreign operations to offset foreign currency translation gains and losses on the net investment. These cross currency swaps have maturity dates beginning on June 30, 2025, through June 30, 2028. At maturity of the cross currency swap contracts we will deliver the notional amount of €15 million and will receive approximately $17.5 million from the counterparties on June 18, 2025; we will deliver the notional amount of €35 million and will receive $37.8 million from the counterparties on March 31, 2028; and we will deliver the notional amount of €90 million and will receive $98.2 million from the counterparties on June 30, 2028.The changes in fair values of the cross currency swap contracts are recorded in AOCI and will be reclassified to earnings when the foreign subsidiaries are sold or substantially liquidated. We recorded a loss of $5.6 million, a gain of $3.8 million, and a gain of $5.4 million, net of tax, within AOCI as a result of these net investment hedges, during the years ended December 31, 2023, 2022, and 2021, respectively. We will receive quarterly interest payments from the counterparties based on a fixed interest rate until maturity of the cross currency swaps. This interest rate component is excluded from the assessment of hedge effectiveness and, thus, is recognized as a reduction to interest expense over the life of the hedge instrument. We recognized approximately $2.1 million and $2.8 million related to the excluded component as a reduction of interest expense for the years ended December 31, 2023 and 2022, respectively. During the second quarter of 2023, the notional amount of €90.0 million in cross currency swaps matured, resulting in a net cash receipt of $6.3 million. The receipt of cash is reflected within investing activities on the Consolidated Statements of Cash Flows. Fair Values of Hedging Instruments Designated as Hedges in Consolidated Balance Sheets The fair values of hedging instruments, their respective classification on the consolidated balance sheets, and amounts subject to offset under master netting arrangements consisted of the following derivative instruments, unless otherwise noted: (in thousands) Hedging Assets December 31, 2023 December 31, 2022 Derivatives and non-derivatives designated as hedging instruments Balance Sheet Classification Foreign currency exchange contracts Other current assets $ 1,783 $ 5,185 Cross currency swaps Other current assets — 8,135 Interest rate swap contract Other long-term assets 1,451 — Cross currency swaps Other long-term assets 664 1,127 Total derivative instruments presented as hedge instruments on the balance sheet 3,898 14,447 Gross amounts subject to master netting arrangements not offset on the balance sheet (1,783) (3,210) Net amount $ 2,115 $ 11,237 (in thousands) Hedging Liabilities December 31, 2023 December 31, 2022 Derivatives and non-derivatives designated as hedging instruments Balance Sheet Classification Foreign currency exchange contracts Accrued liabilities $ 5,532 $ 4,572 Cross currency swaps Other long-term liabilities 5,041 — Total derivative instruments presented as cash flow hedges on the balance sheet 10,573 4,572 Non-derivative foreign currency denominated debt designated as net investment hedge on the balance sheet (1) Long-term debt 98,187 94,775 Total hedging instruments presented on the balance sheet 108,760 99,347 Gross amounts subject to master netting arrangements not offset on the balance sheet (1,783) (3,210) Net amount $ 106,977 $ 96,137 (1) Amounts represent reported carrying amounts of our foreign currency denominated debt. Refer to “Note 18. Fair Value Measurements” for information regarding the fair value of our long-term debt.

REPURCHASES OF COMMON STOCK

REPURCHASES OF COMMON STOCK	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
REPURCHASES OF COMMON STOCK	REPURCHASES OF COMMON STOCK As of December 31, 2023, our Board of Directors has authorized the repurchase of u p to 73.0 million sh ares of our common stock in the open market or in negotiated transactions pursuant to the Company’s share repurchase program. We believe that the repurchase of our common stock is a favorable means of returning value to our stockholders, and we also repurchase to offset the dilutive effect of our share-based compensation programs. Repurchases of our common stock may vary depending upon the level of other investing and deployment activities, as well as share price and prevailing interest rates. As of December 31, 2023, there are approximately 2.9 million remaining shares available for repurchase under this authorization. We primarily acquire shares by repurchases in the open market. However, we also acquire shares that are surrendered by employees in payment for the minimum required statutory withholding taxes due on the vesting of restricted stock units and the settlement of deferred stock units, otherwise referred to herein as employee surrenders. We issue shares of treasury stock upon the vesting of certain restricted stock units and upon the exercise of certain stock options. The number of shares of treasury stock issued during the years ended December 31, 2023, 2022, and 2021, was not material. The Inflation Reduction Act of 2022, which was enacted into law on August 16, 2022, imposed a nondeductible 1% excise tax on the net value of certain stock repurchases made after December 31, 2022, and is included in the cost of treasury stock acquired in repurchases in the open market for the current year. The following is a summary of our open market common stock repurchases, reported on a trade date basis, and shares acquired through employee surrenders: (in thousands, except per share amounts) For the Years Ended December 31, 2023 2022 2021 Shares repurchased in the open market 155 1,963 1,283 Shares acquired through employee surrenders for statutory tax withholding 20 21 29 Total shares repurchased 175 1,984 1,312 Cost of shares repurchased in the open market $ 72,639 $ 810,942 $ 755,545 Cost of shares for employee surrenders 9,974 10,606 15,562 Total cost of shares $ 82,613 $ 821,548 $ 771,107 Average cost per share - open market repurchases $ 468.84 $ 413.12 $ 588.58 Average cost per share - employee surrenders $ 503.28 $ 501.89 $ 548.08 Average cost per share - total $ 472.74 $ 414.06 $ 587.70

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME	12 Months Ended
	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME	ACCUMULATED OTHER COMPREHENSIVE INCOME The changes in AOCI, net of tax, consisted of the following: For the Years Ended December 31, 2023 and 2022 Unrealized Gain (Loss) on Cash Flow Hedges, Net of Tax Unrealized Gain (Loss) on Net Investment Hedges, Net of Tax (in thousands) Unrealized (Loss) Gain on Investments, Net of Tax Foreign Currency Exchange Contracts Interest Rate Swap Euro-Denominated Notes Cross Currency Swaps Defined Benefit Plans, Net of Tax Cumulative Translation Adjustment Total Balance as of December 31, 2021 $ (126) $ 4,979 $ — $ 422 $ 3,240 $ — $ (61,999) $ (53,484) Other comprehensive (loss) income before reclassifications (46) 14,851 — 4,525 3,817 (3,282) (25,692) (5,827) Amounts reclassified from accumulated other comprehensive income — (18,991) — — — 506 — (18,485) Balance as of December 31, 2022 (172) 839 — 4,947 7,057 (2,776) (87,691) (77,796) Other comprehensive income (loss) before reclassifications 8 (792) 3,131 (2,601) (5,629) (1,302) 17,725 10,540 Amounts reclassified from accumulated other comprehensive income — (2,444) (2,025) — — 519 — (3,950) Balance as of December 31, 2023 $ (164) $ (2,397) $ 1,106 $ 2,346 $ 1,428 $ (3,559) $ (69,966) $ (71,206) The following table presents components and amounts reclassified out of AOCI to net income: (in thousands) Affected Line Item in the Statements of Income Amounts Reclassified from AOCI for the Years Ended December 31, 2023 2022 2021 Foreign currency exchange contracts Cost of revenue $ 3,512 $ 25,733 $ (7,121) Tax (expense) benefit (1,068) (6,742) 1,347 Gains (losses), net of tax $ 2,444 $ 18,991 $ (5,774) Interest rate swap contract Interest expense $ 2,656 $ — $ — Tax (expense) (631) — — Gain, net of tax $ 2,025 $ — $ — Defined benefit plans Cost of revenue and operating expenses $ (630) $ (605) $ — Tax benefit 111 99 — (Losses), net of tax $ (519) $ (506) $ —

PREFERRED STOCK

PREFERRED STOCK	12 Months Ended
	Dec. 31, 2023
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
PREFERRED STOCK	PREFERRED STOCK Our Board of Directors is authorized, subject to any limitations prescribed by law, without further stockholder approval, to issue from time to time up to 500,000 shares of Preferred Stock, $1.00 par value per share (“Preferred Stock”), in one or more series. Each such series of Preferred Stock shall have such number of shares, designations, preferences, voting powers, qualifications, and special or relative rights or privileges as shall be determined by the Board of Directors, which may include, among others, dividend rights, voting rights, redemption and sinking fund provisions, liquidation preferences, conversion rights, and preemptive rights. There are no shares of Preferred Stock outstanding as of December 31, 2023 and 2022.

IDEXX RETIREMENT AND INCENTIVE

IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN	IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN We have established the IDEXX Retirement and Incentive Savings Plan (the “401(k) Plan”). U.S. employees eligible to participate in the 401(k) Plan may contribute specified percentages of their salaries. We match a portion of these contributions, not to exceed 5% of participants’ eligible compensation. We matched $30.3 million, $28.3 million, and $25.8 million for the years ended December 31, 2023, 2022, and 2021, respectively. In addition, we may make contributions to the 401(k) Plan at the discretion of the Board of Directors. There were no discretionary contributions in 2023, 2022 or 2021. We also have established defined contribution plans for regional employees in Europe and in Canada. With respect to these plans, our contributions over the past three years have not been material. Defined Benefit Pension Obligations Our Swiss defined benefit pension plans (“Swiss Plans”) are government-mandated retirement plans that provide employees with a minimum investment return. We account for our Swiss Plans in accordance with ASC 715-30, “Defined Benefit Plans - Pension.” As of December 31, 2023, our Swiss Plans had an unfunded net pension obligation of $5.6 million, with a fair value of plan assets of $14.4 million. The investments of the plan assets are measured using a mix of Level 1, Level 2, and Level 3 inputs. For the year ended December 31, 2023, we recognized $1.1 million in expense related to the Swiss Plans. The expense was reflected in cost of revenue, sales & marketing expense, general and administrative expense, and research and development expense, based on employee classification. Future benefits expected to be paid as of December 31, 2023, are as follows: (in thousands) December 31, 2024 $ 829 2025 $ 1,154 2026 $ 1,035 2027 $ 1,087 2028 $ 1,090 2029 through 2033 $ 6,405

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net Income (Loss)	$ 845,042	$ 679,089	$ 744,845

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Estimates	Estimates The preparation of these consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures. On an ongoing basis, we evaluate these estimates, including those related to reserves for accounts receivable, customer contract assets and lease receivables; goodwill and other intangible assets; income taxes; inventory valuation; revenue recognition, including product returns and customer contracts with multiple performance obligations; share-based compensation; warranty reserves; self-insurance reserves; fair value measurements; and loss contingencies. We accrue contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ materially from these estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with original maturities of ninety days or less to be cash equivalents. Cash and cash equivalents consist primarily of demand deposits, money market funds, and short-duration agency bonds and commercial paper as described above, which management believes are subject to minimal credit and market risk.
Warranty Reserves	Warranty ReservesWe provide a standard twelve-month warranty on all diagnostic instruments sold. We recognize the cost of instrument warranties in cost of product revenue at the time revenue is recognized based on the estimated cost to repair the instrument over its warranty period. Cost of product revenue reflects not only estimated warranty expense for instruments sold in the current period, but also any changes in estimated warranty expense for the portion of the aggregate installed base that is under warranty. Estimated warranty expense is based on a variety of inputs, including historical instrument performance in the customers’ environments, historical and estimated costs incurred in servicing instruments, and projected instrument reliability. Should actual service rates or costs differ from our estimates, revisions to the estimated warranty liability would be required. The liability for warranties is included in accrued liabilities in the accompanying consolidated balance sheets.
Taxes Remitted to Governmental Authorities by IDEXX on Behalf of Customer	Taxes Remitted to Governmental Authorities by IDEXX on Behalf of Customers We calculate, collect from our customers, and remit to governmental authorities sales, value-added, and excise taxes assessed by governmental authorities in connection with revenue-producing transactions with our customers. We report these taxes on a net basis and do not include these tax amounts in revenue or cost of product or service revenue.
Research and Development Costs	Research and Development CostsResearch and development costs, which consist of employee compensation and benefits, certain licensing costs, materials, external consulting, and product development costs, are expensed as incurred. We evaluate our research and development costs for capitalization after the technological feasibility has been established for software and products containing software to be sold; however, no costs were capitalized during the years ended December 31, 2023, 2022, and 2021. Software developed to deliver hosted services to our customers has been designated as internal-use, and we capitalize certain costs incurred in connection with developing or obtaining software designated for internal use based on three distinct stages of development. Refer to “Note 9. Property and Equipment, Net” for further information on internal-use software.
Advertising Costs	Advertising CostsAdvertising costs, which are recognized as sales and marketing expense in the period in which they are incurred
Legal Costs	Legal Costs Legal costs are considered period costs and, accordingly, are expensed in the year services are provided.
Foreign Currency	Foreign Currency The functional currency of most of our foreign subsidiaries is their local currency, and a small number of our foreign subsidiaries that conduct business primarily in U.S. dollars have the U.S. dollar as their functional currency. Assets and liabilities of our other foreign subsidiaries, whose functional currency is their local currency, are translated to the U.S. dollar using the exchange rate in effect at the balance sheet date. Revenue and expense accounts are translated to the U.S. dollar using the exchange rate at the date at which those elements are recognized, and where it is impractical to do so, an average exchange rate in effect during the period is used to translate those elements. Cumulative translation gains and losses are shown in the accompanying consolidated balance sheets as a separate component of accumulated other comprehensive income (“AOCI”).
Comprehensive Income	Comprehensive IncomeWe report all changes in equity, including net income and transactions or other events and circumstances from non-owner sources during the period in which they are recognized. We have chosen to present comprehensive income, which encompasses net income, foreign currency translation adjustments, gains and losses on our net investment hedges, defined benefit plan adjustments, and the difference between the cost and the fair market value of investments in debt and equity securities, forward currency exchange contracts, and interest rate swap contracts in the consolidated statements of comprehensive income.
Equity and Cost Methods of Accounting for Investments	Equity and Cost Methods of Accounting for Investments Investments where we have the ability to exercise significant influence, but do not control the entity, are accounted for under the equity method of accounting. Significant influence generally exists if we have a 20% to 50% ownership interest in the investee. Equity investments in entities for which we do not have the ability to exercise significant influence and whose securities do not have a readily determinable fair value are carried at cost less impairment, if any, adjusted for changes resulting from qualifying observable price changes for the identical investment of the same issuer should they occur. We evaluate our investments for impairment whenever events or changes in circumstances indicate that the carrying amounts of such investments may be impaired. If a decline in the value of an investment is determined to be other than temporary, a loss is recorded in earnings in the current period.
Concentrations of Risk	Concentrations of Risk Financial Instruments . Financial instruments that potentially subject us to concentrations of credit risk are principally cash, cash equivalents, accounts receivable, contract assets, lease receivables, and derivatives. To mitigate such risk with respect to cash and cash equivalents, we place our cash with highly-rated financial institutions, in non-interest bearing accounts that are insured by the U.S. government and money market funds invested in government securities. To reduce credit risk with respect to accounts receivable, contract assets, and lease receivables, we routinely assess the financial strength of our most significant customers and monitor the amounts owed to us, taking appropriate action when necessary. Concentrations of credit risk with respect to accounts receivable are limited due to the large number of customers that purchase our products and services, and we have no significant customers that accounted for greater than 10% of our consolidated revenues during the year ended December 31, 2023. As a result, we believe that accounts receivable, contract assets, and lease receivables credit risk exposure is limited. We maintain allowances for expected credit losses, but historically have not experienced material losses related to an individual customer or group of customers in any particular industry or geographic area. To mitigate concentration of credit risk with respect to derivatives, we enter into transactions with highly-rated financial institutions, enter into master netting arrangements with counterparties to our derivative transactions, and frequently monitor the creditworthiness of our counterparties. Our master netting arrangements reduce our exposure in that they permit outstanding receivables and payables with the counterparties to our derivative transactions to be offset in the event of default. We have not incurred such losses and consider the risk of counterparty default to be minimal. Sole and Single-Source Suppliers
New Accounting Pronouncements Adopted and New Accounting Pronouncements Not Yet Adopted	New Accounting Pronouncements Adopted Effective January 1, 2021, we adopted ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” The new guidance is intended to simplify the accounting for income taxes by removing certain exceptions and by updating accounting requirements around goodwill recognized for tax purposes and the allocation of current and deferred tax expense among legal entities, among other minor changes. The adoption of ASU 2019-12 did not have a material impact on our consolidated financial statements. In July 2021, the FASB issued ASU 2021-05, “Leases (Topic 842); Lessors - Certain Leases with Variable Lease Payments.” ASU 2021-05 requires a lessor to classify a lease with variable payments that do not depend on an index or rate as an operating lease if another lease classification (i.e., sales-type or direct financing) would result in recognition of a day-one loss. We elected to adopt this standard as of the third quarter of 2021, on a prospective basis. The adoption of ASU 2021-05 did not have a material impact on our consolidated financial statements. We adopted ASU 2022-04, “Liabilities - Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations,” as of January 1, 2023, which adds certain disclosure requirements for a buyer in a supplier finance program. The amendments in this update require that a buyer in a supplier finance program discloses sufficient information about the program to allow a user of financial statements to understand the program's nature, activity during the period, changes from period to period, and potential magnitude. Refer to “Note 12. Accounts Payable, Accrued Liabilities and Other Long-Term Liabilities.” We adopted ASU 2021-08, “Business Combinations (Topic 805): Accounting for Acquired Contract Assets and Contract Liabilities,” as of January 1, 2023. ASU 2021-08 is intended to improve comparability for both the recognition and measurement of acquired revenue contracts with customers at the date of and after a business combination by providing consistent recognition guidance. The adoption of ASU 2021-08 did not have a material impact on our consolidated financial statements. In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant expenses. The amendments will require disclosure of significant segment expenses that are regularly provided to the chief operating decision maker and included within segment profit and loss. The amendments are effective for annual periods beginning after December 15, 2023, and interim periods beginning after December 15, 2024, with early adoption permitted, and will be applied retrospectively to all prior periods presented in the financial statements. We are currently evaluating ASU 2023-07 to determine its impact on our consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which includes amendments that further enhance income tax disclosures, primarily through standardization and disaggregation of income tax rate reconciliation categories and income taxes paid by jurisdiction. The amendments are effective for annual periods beginning after December 15, 2024, with early adoption permitted, and may be applied either prospectively or retrospectively. We are currently evaluating ASU 2023-09 to determine its impact on our consolidated financial statements.
Revenue Recognition	Revenue Recognition We recognize revenue when, or as, performance obligations under the terms of a contract are satisfied, which occurs when control of the promised products or services is transferred to a customer, and it is probable that we will collect substantially all of the consideration to which we will be entitled, based on the customer’s intent and ability to pay the promised consideration. We exclude sales, use, value-added, and other taxes we collect on behalf of third parties from revenue. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring products or services to a customer. To accurately present the consideration received in exchange for promised products or services, we apply the five-step model outlined below: 1. Identification of a contract or agreement with a customer 2. Identification of our performance obligations in the contract or agreement 3. Determination of the transaction price 4. Allocation of the transaction price to the performance obligations 5. Recognition of revenue when, or as, we satisfy a performance obligation
Share-Based Compensation	We provide for various forms of share-based compensation awards to our employees and non-employee directors. Our share-based compensation plans allow for the issuance of a mix of stock options, restricted stock, stock appreciation rights, employee stock purchase rights, and other stock unit awards. With the exception of stock options, the fair value of our awards is equal to the closing stock price of IDEXX common stock on the date of grant. We calculate the fair value of our stock option awards using the Black-Scholes-Merton option-pricing model. For stock options, restricted stock units (“RSUs”), and deferred stock units (“DSUs”), share-based compensation expense is estimated based on awards ultimately expected to vest, reduced for estimated forfeitures, on a straight-line basis over the requisite service period of the award. For performance-based restricted stock units (“PBRSUs”), share-based compensation expense is estimated based on awards ultimately expected to vest, reduced for estimated forfeitures, on a graded vesting methodology over the requisite service period.
Credit Losses	We are exposed to credit losses primarily through our sales of products and services to our customers. We maintain allowances for credit losses for potentially uncollectible receivables. We base our estimates on a detailed analysis of specific customer situations and a percentage of our accounts receivable by aging category. Additionally, our estimates are developed based on historical credit loss experience, estimates of recoveries, current economic conditions, and future expectations. Adjustments to historical loss information are made for differences in current economic conditions. Additional allowances may be required if either the financial condition of our customers was to deteriorate, or a strengthening U.S. dollar impacts the ability of foreign customers to make payments to us on their U.S. dollar-denominated purchases. We monitor our ongoing credit exposure through active review of counterparty balances against contract terms and due dates. Our activities include timely account reconciliations, dispute resolution, and payment confirmations. We may employ collection agencies and legal counsel to pursue recovery of defaulted receivables. Account balances are charged off against the allowance when we believe it is probable the receivable will not be recovered. We may require collateralized asset support or a prepayment to mitigate credit risk. We do not have any off-balance sheet credit exposure related to our customers.
Inventories	Inventories are stated at the lower of cost (first-in, first-out) or net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. We write down the carrying value of inventory for estimated obsolescence by an amount equal to the difference between the cost of inventory and the estimated market value when warranted based on assumptions of future demand, market conditions, remaining shelf life, or product functionality. If actual market conditions or results of estimated functionality are less favorable than those we estimated, additional inventory write-downs may be required, which would have a negative effect on results of operations.
Leases	The majority of our facilities are occupied under operating lease arrangements with various expiration dates through 2067, some of which include options to extend the life of the lease, and some of which include options to terminate the lease within one year. In certain instances, we are responsible for the real estate taxes and operating expenses related to these facilities. Additionally, we enter into operating leases for certain vehicles and equipment in the normal course of business. We determine the expected term of any executed agreements using the non-cancelable lease term plus any renewal options by which the failure to renew imposes a penalty in such amount that renewal is reasonably assured. The derived expected term is then used in the determination of a financing or operating lease and in the calculation of straight-line rent expense. Rent escalations are considered in the calculation of minimum lease payments in our capital lease tests and in determining straight-line rent expense for operating leases. Minimum lease payments include the fixed lease component of the agreement, as well as fixed rate increases that are initially measured at the lease commencement date. Variable lease payments based on an index and payments associated with non-lease components and short-term rentals (leases with terms less than twelve months) are expensed as incurred. Consideration is allocated to the lease and non-lease components based on the estimated standalone prices. We determine if an arrangement is a lease at its inception. Operating leases are included in operating lease right-of-use assets, accrued liabilities, and long-term operating lease liabilities in our consolidated balance sheets. Our financing leases are not material to the financial statements. Right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease liabilities and right-of-use assets are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an explicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Rent expense for lease payments is recognized on a straight-line basis over the lease term. The operating lease right-of-use assets also include any rent prepayments, lease incentives upon receipt, and straight-line rent expense impacts, which represent the differences between our operating lease liabilities and right-of-use assets.
Property and Equipment	Property and equipment are stated at cost, net of accumulated depreciation and amortization. The costs of additions and improvements are capitalized, while maintenance and repairs are charged to expense as incurred. When an item is sold or retired, the cost and related accumulated depreciation are relieved, and the resulting gain or loss, if any, is recognized in the consolidated statements of income. We evaluate our property and equipment for impairment periodically or as changes in circumstances or the occurrence of events suggest the remaining value is not recoverable from future cash flows. If the carrying value of our property and equipment is impaired, an impairment charge is recorded for the amount by which the carrying value of the property and equipment exceeds its fair value. We provide for depreciation and amortization primarily using the straight-line method by charges to the consolidated statements of income in amounts that allocate the cost of property and equipment over their estimated useful lives as follows: Asset Classification Estimated Useful Life Buildings and improvements 10 to 40 years Leasehold improvements Shorter of remaining lease term or useful life of improvements Machinery and equipment 3 to 8 years Office furniture and equipment 3 to 7 years Computer hardware and software 3 to 7 years We capitalize interest on the acquisition and construction of significant assets that require a substantial period of time to be made ready for use. The capitalized interest is included in the cost of the completed asset and depreciated over the asset’s estimated useful life. The amount of interest capitalized during the years ended December 31, 2023 and 2022, was not material. We capitalize certain costs incurred in connection with developing or obtaining software designated for internal use based on three distinct stages of development. Qualifying costs incurred during the application development stage, which consist primarily of internal payroll and direct fringe benefits and external direct project costs, including labor and travel, are capitalized and amortized on a straight-line basis over the estimated useful life of the asset. Costs incurred during the preliminary project and post-implementation and operation phases are expensed as incurred. These costs relate primarily to the determination of performance requirements, data conversion, and training. Software developed to deliver hosted services to our customers has been designated as internal use.
Goodwill and Other Intangible Assets	A significant portion of the purchase price for acquired businesses is generally assigned to intangible assets. Intangible assets other than goodwill are initially valued at fair value. If a quoted price in an active market for the identical asset is not readily available at the measurement date, the fair value of the intangible asset is estimated based on discounted cash flows using market participant assumptions, which are assumptions that are not specific to IDEXX. The selection of appropriate valuation methodologies and the estimation of discounted cash flows require significant assumptions about the timing and amounts of future cash flows, risks, appropriate discount rates, and the useful lives of intangible assets. When significant, we typically utilize independent valuation experts to advise and assist us in determining the fair values of the identified intangible assets acquired in connection with a business acquisition and in determining appropriate amortization methods and periods for those intangible assets. Goodwill is initially valued based on the excess of the purchase price of a business combination over the fair value of acquired net assets recognized and represents the future economic benefits arising from other assets acquired that could not be separately identified and recognized. Our business combinations regularly include contingent consideration arrangements that require additional consideration to be paid based on the achievement of established objectives, most commonly related to customer retention or revenue growth of the customer base during the post-combination period. We assess contingent consideration to determine if it should be recognized at its fair value on the acquisition date. A liability resulting from contingent consideration is remeasured to fair value at each reporting date until the contingency is resolved, with changes in fair value recognized in earnings if changes in estimates are made after the measurement period. Refer to “Note 18. Fair Value Measurements” for changes in the fair value of contingent consideration and differences arising upon settlements. We assess goodwill for impairment annually, at the reporting unit level in the fourth quarter, and whenever events or circumstances indicate impairment may exist. In evaluating goodwill for impairment, we have the option to first assess the qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the goodwill impairment test. The more likely than not threshold is defined as having a likelihood of more than 50%. If, after assessing the totality of events or circumstances, we determine that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, we assess the fair value of the reporting unit and compare its fair value to its carrying value to determine if the carrying value exceeds its fair value. Any excess of the carrying value of the goodwill above its fair value would be recognized as an impairment loss. In contrast, we can opt to bypass the qualitative assessment for any reporting unit in any period and proceed directly to assessing the fair value of the reporting unit(s), and compare the fair value of the reporting unit to its carrying value to determine if any impairment exists. Doing so does not preclude us from performing the qualitative assessment in any subsequent period. A prolonged economic downturn that results in lower long-term growth rates and reduced long-term profitability may reduce the fair value of our reporting units. Industry specific events or circumstances could have a negative impact on our reporting units and may also reduce the fair value of our reporting units. Should such events occur, and it becomes more likely than not that a reporting unit’s fair value has fallen below its carrying value, we will perform an interim goodwill impairment test, in addition to the annual impairment test. Future impairment tests may result in an impairment of goodwill. An impairment of goodwill would be reported as a non-cash charge to earnings. In the fourth quarter of 2023, we performed a qualitative assessment of goodwill impairment and concluded that there were no indications the carrying values of any of our reporting units exceeded their fair values. We had no goodwill impairments during the years ended December 31, 2023, 2022, or 2021. We assess the realizability of intangible assets other than goodwill whenever events or changes in circumstances indicate that the carrying value may not be recoverable. If an impairment review is triggered, we evaluate the carrying value of intangible assets, other than goodwill, based on estimated undiscounted future cash flows over the remaining useful life of the primary asset of the asset group and compare that value to the carrying value of the asset group. The asset group is the lowest level for which identifiable cash flows associated with the intangible asset are largely independent. The cash flows that are used contain our best estimates, using appropriate and customary assumptions and projections at the time. If the net carrying value of the asset group exceeds the related estimated undiscounted future cash flows, an impairment loss to adjust the intangible asset to its fair value would be reported as a non-cash charge to earnings. If necessary, we would calculate the fair value of an intangible asset using the present value of the estimated future cash flows to be generated by the intangible asset and apply a risk-adjusted discount rate. We had no impairments of our intangible assets during the years ended December 31, 2023, 2022, and 2021. We provide for amortization primarily using the straight-line method by charges to income in amounts that allocate the intangible assets over their estimated useful lives as follows: Asset Classification Estimated Useful Life Customer-related intangible assets (1) 3 to 17 years Product rights (2) 5 to 15 years Noncompete agreements 3 to 5 years
Accounts Payable - Supplier Financing Program	Accounts Payable - Supplier Financing Program
Income Taxes	The provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, deferred taxes represent the estimated future tax effects of temporary differences between book and tax treatment of assets and liabilities and carryforwards to the extent they are realizable. We record a valuation allowance to reduce our deferred tax assets to the amount that is more likely than not to be realized. In assessing the need for a valuation allowance, we consider future taxable income and ongoing prudent and feasible tax planning strategies. In the event that we determine that we would be able to realize our deferred tax assets in the future in excess of the net recorded amount, a reduction of the valuation allowance would increase income in the period such determination was made. Likewise, should we determine that we would not be able to realize all or part of our net deferred tax asset in the future, a reduction to the deferred tax asset would be charged to income in the period such determination was made. We record a liability for uncertain tax positions that do not meet the more likely than not standard as prescribed by the authoritative guidance for income tax accounting. We record tax benefits for only those positions that we believe will more likely than not be sustained. Unrecognized tax benefits are the differences between tax positions taken, or expected to be taken, in tax returns, and the benefits recognized for accounting purposes. We classify uncertain tax positions as long-term liabilities. Significant judgment is required in determining our worldwide provision for income taxes and our income tax filings are regularly under audit by tax authorities. Any audit result differing from amounts recorded would increase or decrease income in the period that we determine such adjustment is likely. Interest expense and penalties associated with the underpayment of income taxes are included in income tax expense.
Earnings Per Share	Basic earnings per share is computed by dividing net income attributable to our stockholders by the weighted average number of shares of common stock and vested deferred stock units outstanding during the year. The computation of diluted earnings per share is similar to the computation of basic earnings per share, except that the denominator is increased for the assumed exercise of dilutive options and assumed issuance of unvested restricted stock units and unvested deferred stock units using the treasury stock method unless the effect is anti-dilutive. The treasury stock method assumes that proceeds, including cash received from the exercise of employee stock options and the total unrecognized compensation expense for unvested share-based compensation awards, would be used to purchase our common stock at the average market price during the period. Vested deferred stock units outstanding are included in shares outstanding for basic and diluted earnings per share because the associated shares of our common stock are issuable for no cash consideration, the number of shares of our common stock to be issued is fixed, and issuance is not contingent.
Contingencies	We are subject to claims that may arise in the ordinary course of business, including with respect to actual and threatened litigation and other matters. We accrue for loss contingencies when it is probable that future expenditures will be made, and such expenditures can be reasonably estimated. However, the results of legal actions cannot be predicted with certainty, and therefore our actual losses with respect to these contingencies could exceed our accruals.
Fair Value Measurements	U.S. GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. U.S. GAAP requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. We have certain financial assets and liabilities that are measured at fair value on a recurring basis, certain nonfinancial assets and liabilities that may be measured at fair value on a non-recurring basis, and certain financial assets and liabilities that are not measured at fair value in our consolidated balance sheets but for which we disclose the fair value. The fair value disclosures of these assets and liabilities are based on a three-level hierarchy, which is defined as follows: Level 1 Quoted prices in active markets for identical assets or liabilities that the entity can access at the measurement date. Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. We did not have any transfers between Level 1 and Level 2, or transfers in or out of Level 3, of the fair value hierarchy during the years ended December 31, 2023 and 2022. Our cross currency swap contracts are measured at fair value on a recurring basis in our accompanying consolidated balance sheets and are classified as derivative instruments. We measure the fair value of our cross currency swap contracts using prevailing market conditions as of the close of business on each balance sheet date. The product of this calculation is then adjusted for counterparty risk. Our foreign currency exchange contracts are measured at fair value on a recurring basis in our accompanying consolidated balance sheets and are classified as derivative instruments. We measure the fair value of our foreign currency exchange contracts using an income approach, based on prevailing market forward rates less the contract rate multiplied by the notional amount. The product of this calculation is then adjusted for counterparty risk. Our interest rate swap contract is measured at fair value on a recurring basis in our accompanying consolidated balance sheets and is classified as a derivative instrument. We measure the fair value of our interest rate swap using current market interest rates for debt issues with similar remaining years to maturity, adjusted for applicable credit risk.
Hedging Instruments	We are exposed to certain risks related to our ongoing business operations. We utilize hedging instruments to manage a portion of our foreign currency exchange risk and interest rate risk. During the first quarter of 2023, we entered into an interest rate swap to manage the impact of interest rate fluctuations associated with $250.0 million of borrowings under our variable-rate Credit Facility. We have designated the interest rate swap as a cash flow hedge. Our subsidiaries enter into foreign currency exchange contracts to manage the exchange risk associated with their forecasted intercompany inventory purchases and sales for the next year. From time to time, we may also enter into other foreign currency exchange contracts, cross currency swaps, or foreign-denominated debt issuances to minimize the impact of foreign currency fluctuations associated with specific balance sheet exposures, including net investments in certain foreign subsidiaries. The primary purpose of our foreign currency hedging activities is to protect against the volatility associated with foreign currency transactions, including transactions denominated in euro, British pound, Japanese yen, Canadian dollar, and Australian dollar. We also utilize natural hedges to mitigate our transaction and commitment exposures. Our corporate policy prescribes the range of allowable hedging activity. We enter into foreign currency exchange contracts with large, well-capitalized multinational financial institutions and we do not hold or engage in transactions involving derivative instruments for purposes other than risk management. Our accounting policies for these contracts are based on our designation of such instruments as hedging transactions. We recognize all hedging instrument assets and liabilities on the balance sheet at fair value at the balance sheet date. Instruments that do not qualify for hedge accounting treatment must be recorded at fair value through earnings. To qualify for hedge accounting treatment, cash flow and net investment hedges must be highly effective in offsetting changes to expected future cash flows or fair value on hedged transactions. If the instrument qualifies for hedge accounting, changes in the fair value of the hedging instrument from the effective portion of the hedge are deferred in AOCI, net of tax, and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. We immediately record in earnings the extent to which a hedging instrument is not effective in achieving offsetting changes in fair value. We de-designate hedging instruments from hedge accounting when the likelihood of the hedged transaction occurring becomes less than probable. For de-designated instruments, the gain or loss from the time of de-designation through maturity of the instrument is recognized in earnings. Any gain or loss in AOCI at the time of de-designation is reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Refer to “Note 21. Accumulated Other Comprehensive Income” for further information regarding the effect of hedging instruments on the consolidated statements of income for the years ended December 31, 2023, 2022, and 2021. We enter into master netting arrangements with the counterparties to our derivative transactions which permit certain outstanding receivables and payables to be offset in the event of default. Our derivative contracts do not require either party to post cash collateral. We elect to present our derivative assets and liabilities in the accompanying consolidated balance sheets on a gross basis. All cash flows related to our foreign currency exchange contracts are classified as operating cash flows, which is consistent with the cash flow treatment of the underlying items being hedged. Refer to “Note 18. Fair Value Measurements” for additional information regarding the fair value of our derivative instruments and “Note 21. Accumulated Other Comprehensive Income” for additional information regarding the effect of derivative instruments designated as cash flow hedges on the consolidated statements of income. Cash Flow Hedges We have designated our foreign currency exchange contracts and our interest rate swap as cash flow hedges as these derivative instruments manage our exposure to variability in the cash flows of forecasted transactions attributable to foreign currency exchange and to interest rates on variable interest obligations under the terms of our Credit Facility. Unless noted otherwise, we have also designated our derivative instruments as qualifying for hedge accounting treatment.

REVENUE (Tables)

REVENUE (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Revenues By Major Product and Service Category	The following table presents revenue by major product and service categories: (in thousands) For the Years Ended December 31, 2023 2022 2021 CAG segment revenue: CAG Diagnostics recurring revenue: $ 2,935,425 $ 2,660,280 $ 2,534,562 IDEXX VetLab consumables 1,188,261 1,057,236 1,006,781 Rapid assay products 344,494 313,667 296,852 Reference laboratory diagnostic and consulting services 1,278,617 1,178,113 1,123,656 CAG Diagnostics services and accessories 124,053 111,264 107,273 CAG Diagnostics capital - instruments 137,603 147,326 149,140 Veterinary software, services and diagnostic imaging systems: 279,328 251,187 206,258 Recurring revenue 214,597 180,973 147,498 Systems and hardware 64,731 70,214 58,760 CAG segment revenue 3,352,356 3,058,793 2,889,960 Water segment revenue 168,149 155,720 146,505 LPD segment revenue 121,659 122,607 135,887 Other segment revenue 18,789 30,204 43,008 Total revenue $ 3,660,953 $ 3,367,324 $ 3,215,360
Schedule of Revenue By Principal Geographic Area, Based On Customers’ Domiciles	The following table presents revenue by principal geographic area, based on customers’ domiciles: (in thousands) For the Years Ended December 31, 2023 2022 2021 Americas United States $ 2,391,427 $ 2,182,959 $ 1,995,683 Canada 150,110 142,743 139,727 Latin America & Caribbean 83,923 75,035 66,623 2,625,460 2,400,737 2,202,033 Europe, the Middle East and Africa Germany 149,789 137,876 146,762 United Kingdom 121,745 110,400 114,955 France 96,797 84,479 90,836 Italy 53,787 48,192 52,062 Spain 52,332 46,982 48,169 Switzerland 34,830 30,646 31,984 Netherlands 30,508 26,882 29,656 Other 176,396 161,577 167,525 716,184 647,034 681,949 Asia Pacific Region Australia 95,465 96,408 94,414 Japan 75,569 77,661 84,275 China 44,168 49,193 63,166 Other 104,107 96,291 89,523 319,309 319,553 331,378 Total $ 3,660,953 $ 3,367,324 $ 3,215,360

SHARE-BASED COMPENSATION (Table

SHARE-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Compensation Costs and Related Tax Benefits	The following is a summary of share-based compensation costs and related tax benefits recorded in our consolidated statements of income: (in thousands) For the Years Ended December 31, 2023 2022 2021 Share-based compensation expense included in cost of revenue $ 5,643 $ 4,638 $ 4,044 Share-based compensation expense included in operating expenses 54,096 45,132 33,711 Total share-based compensation expense included in consolidated statements of income 59,739 49,770 37,755 Income tax benefit resulting from share-based compensation expense (5,487) (4,658) (4,734) Net share-based compensation expense included in consolidated statements of income, excluding tax benefit from settlement of share-based awards 54,252 45,112 33,021 Income tax benefit resulting from settlement of share-based awards (13,703) (12,522) (32,474) Net expense related to share-based compensation arrangements included in consolidated statements of income $ 40,549 $ 32,590 $ 547
Schedule of Weighted Averages of the Assumptions used in Estimating the Fair Value of Stock Option Awards	The weighted averages of the valuation assumptions used to determine the fair value of each option award on the date of grant and the weighted average estimated fair values were as follows: For the Years Ended December 31, 2023 2022 2021 Expected stock price volatility 32 % 30 % 30 % Expected term, in years 6.7 6.4 6.2 Risk-free interest rate 3.7 % 2.1 % 0.7 % Weighted average fair value of options granted $ 201.48 $ 166.30 $ 169.15
Schedule of Stock Option Activity	A summary of the status of options granted under our share-based compensation plans at December 31, 2023, and changes during the year then ended, are presented in the table below: Number of Options (000) Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value ($000) Outstanding as of December 31, 2022 1,701 $ 219.90 Granted 142 $ 503.50 Exercised (215) $ 147.69 Forfeited (26) $ 432.43 Expired (6) $ 545.55 Outstanding as of December 31, 2023 1,596 $ 250.14 4.8 $ 487,487 Fully vested as of December 31, 2023 1,209 $ 186.45 3.9 $ 446,109 Fully vested and expected to vest as of December 31, 2023 (1) 1,581 $ 247.85 4.8 $ 486,636 (1) Includes options that are vested as of December 31, 2023, and outstanding options that are expected to vest in the future, net of estimated forfeitures.
Schedule of Restricted Stock Unit Activity	A summary of the status of RSUs and PBRSUs granted under our share-based compensation plans at December 31, 2023, and changes during the period then ended, are presented in the table below: Number of Units (000) Weighted Average Grant-Date Fair Value Nonvested as of December 31, 2022 148 $ 391.55 Granted 63 Vested (62) Forfeited (8) Nonvested as of December 31, 2023 141 $ 459.11 Expected to vest as of December 31, 2023 (1) 134 $ 457.51 (1) Outstanding units that are expected to vest in the future, net of estimated forfeitures.

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
	Dec. 31, 2023
Inventory, Net [Abstract]
Schedule of Components of Inventories	The components of inventories are as follows: (in thousands) December 31, 2023 December 31, 2022 Raw materials $ 106,392 $ 92,796 Work-in-process 28,989 28,041 Finished goods 244,901 246,986 Inventories $ 380,282 $ 367,823

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Schedule of Maturities of Operating Lease Liabilities	Maturities of operating lease liabilities are as follows: (in thousands) December 31, 2023 2024 $ 24,231 2025 23,478 2026 21,030 2027 16,138 2028 11,981 Thereafter 43,698 Total lease payments 140,556 Less imputed interest (21,083) Total lease liabilities (current and long-term) $ 119,473
Schedule of Lease and Supplemental Cash Flow Information	December 31, 2023 December 31, 2022 Weighted average remaining lease term - operating leases 8.9 years 9.7 years Weighted average discount rate - operating leases 4.0 % 3.5 % Supplemental cash flow information for leases is as follows: For the Years Ended (in thousands) 2023 2022 Cash paid for amounts included in the measurement of operating lease liabilities $ 27,525 $ 24,973 Right-of-use assets obtained in exchange for operating lease obligations, net of early lease terminations $ 19,443 $ 36,817

PROPERTY AND EQUIPMENT, NET (Ta

PROPERTY AND EQUIPMENT, NET (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Schedule of Estimated Useful Lives for Property and Equipment	We provide for depreciation and amortization primarily using the straight-line method by charges to the consolidated statements of income in amounts that allocate the cost of property and equipment over their estimated useful lives as follows: Asset Classification Estimated Useful Life Buildings and improvements 10 to 40 years Leasehold improvements Shorter of remaining lease term or useful life of improvements Machinery and equipment 3 to 8 years Office furniture and equipment 3 to 7 years Computer hardware and software 3 to 7 years
Schedule of Property and Equipment	Property and equipment, net, consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Land and improvements $ 22,400 $ 22,221 Buildings and improvements 432,038 356,049 Leasehold improvements 116,347 107,251 Machinery and equipment 431,914 404,963 Office furniture and equipment 78,941 71,625 Computer hardware and software 326,295 295,969 Construction in progress 79,059 97,310 1,486,994 1,355,388 Less accumulated depreciation and amortization 784,817 705,914 Total property and equipment, net $ 702,177 $ 649,474
Schedule of Depreciation and Amortization, Capitalized Computer Software for Internal Use and Unpaid Property Equipment Reflected in Accounts Payable and Accrued Expenses	Below are the amounts of depreciation and amortization of property and equipment, capitalized computer software for internal use, unpaid property and equipment reflected in accounts payable and accrued expenses, and rental and reagent rental program instruments transferred from inventory to property and equipment: For the Years Ended December 31, (in thousands) 2023 2022 2021 Depreciation and amortization expense $ 100,994 $ 96,746 $ 92,376 Capitalization of internal-use software development costs during the period $ 37,120 $ 20,329 $ 14,753 Unpaid property and equipment, reflected in accounts payable and accrued liabilities at end of year $ 12,061 $ 18,334 $ 19,326 Rental and operating-type reagent rental program instruments transferred from inventory to property and equipment during the period (Note 3) $ 14,608 $ 17,407 $ 11,628

OTHER CURRENT AND LONG-TERM A_2

OTHER CURRENT AND LONG-TERM ASSETS (Tables)	12 Months Ended
	Dec. 31, 2023
Other Assets, Noncurrent [Abstract]
Schedule of Other Current Assets	Other current assets consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Contract assets, net (1) $ 55,111 $ 41,854 Consideration paid to customers (2) 54,081 50,776 Prepaid expenses 48,370 41,742 Taxes receivable 16,972 48,430 Other 29,061 37,687 Other current assets $ 203,595 $ 220,489 (1) Contract assets, net, are net of allowances for credit losses. Refer to “Note 6. Credit Losses.”
Schedule of Other Long-term Assets	Other long-term assets consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Contract assets, net (1) $ 167,963 $ 148,971 Consideration paid to customers (2) 114,850 107,205 Deferred income taxes 107,364 55,215 Equity investments 30,250 30,250 Investment in long-term product supply arrangements 25,943 25,250 Other 50,164 50,838 Other long-term assets $ 496,534 $ 417,729 (1) Contract assets, net, are net of allowances for credit losses. Refer to “Note 6. Credit Losses.”

GOODWILL AND INTANGIBLE ASSET_2

GOODWILL AND INTANGIBLE ASSETS, NET (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill for the years ended December 31, 2023, 2022, and 2021, were as follows: (in thousands) CAG Water LPD Other Consolidated Total Balance as of December 31, 2020 $ 210,394 $ 12,023 $ 14,399 $ 6,531 $ 243,347 Business combinations 120,346 — — — 120,346 Impact of changes in foreign currency exchange rates (3,569) (84) (695) — (4,348) Balance as of December 31, 2021 $ 327,171 $ 11,939 $ 13,704 $ 6,531 $ 359,345 Business combinations 1,641 6,857 — — 8,498 Impact of changes in foreign currency exchange rates (5,330) (897) 179 — (6,048) Balance as of December 31, 2022 $ 323,482 $ 17,899 $ 13,883 $ 6,531 $ 361,795 Business combinations — — — — — Impact of changes in foreign currency exchange rates 2,740 321 1,105 — 4,166 Balance as of December 31, 2023 $ 326,222 $ 18,220 $ 14,988 $ 6,531 $ 365,961
Schedule of Estimated Useful Lives for Intangible Assets	We provide for amortization primarily using the straight-line method by charges to income in amounts that allocate the intangible assets over their estimated useful lives as follows: Asset Classification Estimated Useful Life Customer-related intangible assets (1) 3 to 17 years Product rights (2) 5 to 15 years Noncompete agreements 3 to 5 years
Schedule of Intangible Assets Other Than Goodwill	Intangible assets other than goodwill consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Cost Accumulated Amortization Net Cost Accumulated Amortization Net Customer-related intangible assets (1) $ 102,217 $ 37,782 $ 64,435 $ 104,111 $ 30,952 $ 73,159 Product rights (2) 27,317 8,606 18,711 30,176 8,039 22,137 Noncompete agreements 4,012 2,658 1,354 4,432 2,056 2,376 $ 133,546 $ 49,046 $ 84,500 $ 138,719 $ 41,047 $ 97,672 The above table excludes fully amortized intangible assets for the periods presented. (1) Customer-related intangible assets are comprised of customer lists and customer relationships acquired from third parties. (2) Product rights comprise certain technologies, intellectual property, licenses, and trade names acquired from third parties.
Schedule of Expected Amortization Expense	At December 31, 2023, the aggregate amortization expense associated with intangible assets is estimated to be as follows for each of the next five years and thereafter: (in thousands) Amortization Expense 2024 $ 12,834 2025 12,097 2026 11,835 2027 10,522 2028 9,204 Thereafter 28,008 $ 84,500

ACCOUNTS PAYABLE, ACCRUED LIA_2

ACCOUNTS PAYABLE, ACCRUED LIABILITIES AND OTHER LONG-TERM LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2023
Accrued Liabilities, Current [Abstract]
Schedule of Outstanding Payment Obligations	The changes in our outstanding payment obligations under the supplier financing arrangement, which are included in accounts payable (in thousands) For the Years Ended December 31, 2023 2022 Payment obligations outstanding at the beginning of the period $ 10,171 $ 4,775 Payment obligation additions during the period 45,765 58,936 Payment obligations settled during the period (46,878) (53,540) Payment obligations outstanding at the end of the period $ 9,057 $ 10,171
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Accrued employee compensation and related expenses $ 174,375 $ 142,994 Accrued expenses 113,596 149,446 Accrued taxes 86,553 48,547 Accrued customer incentives and refund obligations 84,386 72,250 Current lease liabilities 19,802 20,425 Accrued liabilities $ 478,712 $ 433,662
Schedule of Other Long-term Liabilities	Other long-term liabilities consisted of the following: (in thousands) December 31, 2023 December 31, 2022 Accrued taxes $ 39,642 $ 49,142 Other accrued long-term expenses 25,884 18,445 Other long-term liabilities $ 65,526 $ 67,587

DEBT (Tables)

DEBT (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Instruments [Abstract]
Schedule of Long-term Debt Instruments	The following describes all of our currently outstanding unsecured senior notes issued and sold in private placements (collectively, the “Senior Notes”) as of December 31, 2023: (Principal Amount in thousands) Issue Date Due Date Series Principal Amount Coupon Rate Senior Note Agreement 12/11/2013 12/11/2025 2025 Series B Notes $ 75,000 4.04 % NY Life 2013 Note Agreement 9/4/2014 9/4/2026 2026 Senior Notes $ 75,000 3.72 % NY Life 2014 Note Agreement 7/21/2014 7/21/2024 2024 Series B Notes $ 75,000 3.76 % Prudential 2015 Amended Agreement 6/18/2015 6/18/2025 2025 Series C Notes € 88,857 1.785 % Prudential 2015 Amended Agreement 2/12/2015 2/12/2027 2027 Series B Notes $ 75,000 3.72 % MetLife 2014 Note Agreement 3/14/2019 3/14/2029 2029 Series C Notes $ 100,000 4.19 % MetLife 2014 Note Agreement 4/2/2020 4/2/2030 MetLife 2030 Series D Notes $ 125,000 2.50 % MetLife 2014 Note Agreement 4/14/2020 4/14/2030 Prudential 2030 Series D Notes $ 75,000 2.50 % Prudential 2015 Amended Agreement
Schedule of Future Maturities of Long-term Debt	Future maturities of long-term debt at December 31, 2023, are as follows: (in thousands) Years Ending December 31, Amount 2024 $ 75,000 2025 173,187 2026 75,000 2027 75,000 2028 — Thereafter 300,000 $ 698,187

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Earnings before Income Taxes	Earnings before income taxes were as follows: (in thousands) For the Years Ended December 31, 2023 2022 2021 Domestic $ 889,133 $ 684,661 $ 689,994 International 172,043 175,311 212,660 $ 1,061,176 $ 859,972 $ 902,654
Schedule of Components of Provision (Benefit) for Income Taxes	The provision (benefit) for income taxes comprised the following: (in thousands) For the Years Ended December 31, 2023 2022 2021 Current Federal $ 191,274 $ 150,099 $ 112,811 State 40,369 30,529 19,147 International 32,797 35,138 29,288 264,440 215,766 161,246 Deferred Federal (36,501) (31,663) (7,019) State (6,462) (5,735) (503) International (5,343) 2,515 4,086 (48,306) (34,883) (3,436) $ 216,134 $ 180,883 $ 157,810
Schedule of Effective Income Tax Rate Reconciliation	The provision for income taxes differs from the amounts computed by applying the statutory federal income tax rate as follows: For the Years Ended December 31, 2023 2022 2021 U.S. federal statutory rate 21.0 % 21.0 % 21.0 % State income tax, net of federal tax benefit 2.7 2.3 2.1 Taxation on international earnings (0.1) 0.6 (0.8) Foreign derived intangible income (1.4) (1.7) (1.2) Share-based compensation from settlements (1.3) (1.5) (3.6) Research and development credit (1.2) (1.1) (0.7) Other, net 0.7 1.4 0.7 Effective tax rate 20.4 % 21.0 % 17.5 %
Schedule of Components of Net Deferred Tax Assets and Liabilities	The components of the net deferred tax assets (liabilities) included in the accompanying consolidated balance sheets are as follows: (in thousands) December 31, 2023 December 31, 2022 Assets Accrued expenses $ 44,043 $ 38,457 Accounts receivable reserves 2,700 2,447 Deferred revenue 6,427 4,671 Inventory basis differences 24,500 9,062 Property-based differences 18,036 20,157 Intangible asset basis differences 47,089 44,196 Share-based compensation 12,061 11,324 Other 2,267 1,273 Net operating loss carryforwards 9,007 8,956 Tax credit carryforwards 12,824 13,370 Unrealized losses on foreign currency exchange contracts and investments 821 227 Research and development expenditure differences 66,705 29,997 Total assets 246,480 184,137 Valuation allowance (34,793) (39,726) Total assets, net of valuation allowance 211,687 144,411 Liabilities Customer acquisition costs (39,318) (37,223) Property-based differences (52,235) (44,295) Intangible asset basis differences (6,335) (2,379) Other (11,639) (8,958) Unrealized gains on foreign currency exchange contracts and investments (1,813) (4,491) Total liabilities (111,340) (97,346) Net deferred tax assets $ 100,347 $ 47,065
Schedule of Valuation Allowance	The following table summarizes the changes in valuation allowance for deferred tax assets: (in thousands) For the Years Ended December 31, 2023 2022 2021 Balance at beginning of year $ 39,726 $ 39,280 $ 40,262 Charges to costs and expense 21 2,200 1,464 Write-off/cash payments (7,846) (1,537) (1,182) Foreign currency translation 2,892 (217) (1,264) Balance at the end of the year $ 34,793 $ 39,726 $ 39,280
Schedule of Changes in Unrecognized Tax Benefits	The following table summarizes the changes in unrecognized tax positions: (in thousands) For the Years Ended December 31, 2023 2022 2021 Total amounts of unrecognized tax benefits, beginning of period $ 22,547 $ 21,789 $ 22,484 Gross increases in unrecognized tax positions as a result of tax positions taken during a prior period 6,366 342 443 Gross increases in unrecognized tax positions as a result of tax positions taken in the current period 3,987 3,197 2,414 Decreases in unrecognized tax positions related to settlements with taxing authorities (7,535) (1,544) (537) Decreases in unrecognized tax positions as a result of a lapse of the applicable statutes of limitations (3,045) (1,237) (3,015) Total amounts of unrecognized tax benefits, end of period $ 22,320 $ 22,547 $ 21,789

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Schedule of Reconciliation of Shares Outstanding for Basic and Diluted Earnings Per Share	The following is a reconciliation of weighted average shares outstanding for basic and diluted earnings per share: (in thousands) For the Years Ended December 31, 2023 2022 2021 Shares outstanding for basic earnings per share: 83,066 83,623 85,200 Shares outstanding for diluted earnings per share: Shares outstanding for basic earnings per share 83,066 83,623 85,200 Dilutive effect of share-based payment awards 912 977 1,372 83,978 84,600 86,572
Schedule of Number of Anti-dilutive Stock Awards and Options	The following table presents information concerning those anti-dilutive awards and options: (in thousands) For the Years Ended December 31, 2023 2022 2021 Weighted average number of shares underlying anti-dilutive options 381 263 121 Weighted average number of shares underlying anti-dilutive awards 1 46 —

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Segment Performance	The following is a summary of segment performance: (in thousands) For the Years Ended December 31, CAG Water LPD Other Consolidated Total 2023 Revenue $ 3,352,356 $ 168,149 $ 121,659 $ 18,789 $ 3,660,953 Income from operations $ 1,012,740 $ 74,340 $ 9,975 $ 73 $ 1,097,128 Interest expense, net (35,952) Income before provision for income taxes 1,061,176 Provision for income taxes 216,134 Net income 845,042 Less: Net income attributable to noncontrolling interest — Net income attributable to IDEXX Laboratories, Inc. stockholders $ 845,042 Depreciation and amortization $ 103,554 $ 4,117 $ 3,657 $ 3,580 $ 114,908 2022 Revenue $ 3,058,793 $ 155,720 $ 122,607 $ 30,204 $ 3,367,324 Income from operations $ 800,949 $ 72,519 $ 19,809 $ 5,488 $ 898,765 Interest expense, net (38,793) Income before provision for income taxes 859,972 Provision for income taxes 180,883 Net income 679,089 Less: Net income attributable to noncontrolling interest — Net income attributable to IDEXX Laboratories, Inc. stockholders $ 679,089 Depreciation and amortization $ 101,254 $ 3,020 $ 3,797 $ 3,829 $ 111,900 2021 Revenue $ 2,889,960 $ 146,505 $ 135,887 $ 43,008 $ 3,215,360 Income from operations $ 824,022 $ 65,444 $ 28,636 $ 13,926 $ 932,028 Interest expense, net (29,374) Income before provision for income taxes 902,654 Provision for income taxes 157,810 Net income 744,844 Less: Net income attributable to noncontrolling interest (1) Net income attributable to IDEXX Laboratories, Inc. stockholders $ 744,845 Depreciation and amortization $ 94,202 $ 2,709 $ 3,908 $ 3,777 $ 104,596
Schedule of Net Long-lived Assets by Principal Geographic Areas	Net long-lived assets, consisting of net property and equipment, are subject to geographic risks because they are generally difficult to move and to effectively utilize in another geographic area in a reasonable time period and because they are relatively illiquid. Net long-lived assets by principal geographic areas were as follows: (in thousands) December 31, 2023 December 31, 2022 Americas United States $ 531,735 $ 486,690 Brazil 33,236 25,949 Canada 7,032 7,407 572,003 520,046 Europe, the Middle East and Africa Germany 56,115 55,726 United Kingdom 10,900 10,710 Netherlands 10,604 11,975 France 1,724 1,507 Switzerland 14,129 13,445 Other 2,907 3,054 96,379 96,417 Asia Pacific Region Japan 4,892 5,111 Australia 21,922 20,243 Other 6,981 7,657 33,795 33,011 Total $ 702,177 $ 649,474

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis	The following tables set forth our assets and liabilities that were measured at fair value on a recurring basis by level within the fair value hierarchy: (in thousands) As of December 31, 2023 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Balance at December 31, 2023 Assets Money market funds (1) $ 290,807 $ — $ — $ 290,807 Equity mutual funds (2) $ 99 $ — $ — $ 99 Cross currency swaps (3) $ — $ 664 $ — $ 664 Foreign currency exchange contracts (3) $ — $ 1,783 $ — $ 1,783 Interest rate swap (4) $ — $ 1,451 $ — $ 1,451 Liabilities Cross currency swaps (3) $ — $ 5,041 $ — $ 5,041 Foreign currency exchange contracts (3) $ — $ 5,532 $ — $ 5,532 Deferred compensation (5) $ 99 $ — $ — $ 99 (in thousands) As of December 31, 2022 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Balance at December 31, 2022 Assets Equity mutual funds (2) $ 385 $ — $ — $ 385 Cross currency swaps (3) $ — $ 9,262 $ — $ 9,262 Foreign currency exchange contracts (3) $ — $ 5,185 $ — $ 5,185 Liabilities Foreign currency exchange contracts (3) $ — $ 4,572 $ — $ 4,572 Deferred compensation (5) $ 385 $ — $ — $ 385 Contingent payments - acquisitions $ — $ — $ 120 $ 120 (1) Money market funds with an original maturity of less than ninety days are included within cash and cash equivalents. The remaining balance of cash and cash equivalents as of December 31, 2023, consisted of demand deposits. (2) Equity mutual funds relate to a deferred compensation plan that was assumed as part of a previous business combination. This amount is included within other current assets. Refer to footnote (5) below for a discussion of the related deferred compensation liability. (3) Cross currency swaps and foreign currency exchange contracts are included within other current assets; other long-term assets; accrued liabilities; or other long-term liabilities depending on the gain (loss) position and anticipated settlement date. (4) The interest rate swap is included within other long-term assets. (5) A deferred compensation plan assumed as part of a previous business combination is included within accrued liabilities. The fair value of our deferred compensation plan is indexed to the performance of the underlying equity mutual funds discussed in footnote (2) above.
Schedule of Contingent Consideration Liability	We record changes in the estimated fair value of contingent consideration in the consolidated statements of income. Changes in contingent consideration liabilities are measured at fair value on a recurring basis using unobservable inputs (Level 3) and during the years ended December 31, 2023, and 2022, are as follows: (in thousands) Fair Value Contingent consideration as of December 31, 2021 $ 7,230 Payment of contingent consideration (7,110) Change in estimated fair value — Contingent consideration as of December 31, 2022 120 Payment of contingent consideration (99) Change in estimated fair value (21) Contingent consideration as of December 31, 2023 $ —

HEDGING INSTRUMENTS (Tables)

HEDGING INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Details of Net Investment Hedges and Income Statement Impact of Hedging Instruments	The following table presents the effect of cash flow hedge accounting on our consolidated statements of income and comprehensive income, and provides information regarding the location and amounts of pretax gains or losses of derivatives: (in thousands) Years Ended December 31, 2023 2022 2021 Financial statement line items in which effects of cash flow hedges are recorded Cost of revenue $ 1,470,983 $ 1,362,986 $ 1,325,928 Foreign exchange contracts Amount of gain (loss) reclassified from accumulated other comprehensive income into income $ 3,512 $ 25,733 $ (7,121) Financial statement line items in which effects of cash flow hedges are recorded Interest expense $ (41,581) $ (39,858) $ (29,808) Interest rate swap contract Amount of gain reclassified from accumulated other comprehensive income into net income $ 2,656 $ — $ —
Schedule of Hedging Instruments	The fair values of hedging instruments, their respective classification on the consolidated balance sheets, and amounts subject to offset under master netting arrangements consisted of the following derivative instruments, unless otherwise noted: (in thousands) Hedging Assets December 31, 2023 December 31, 2022 Derivatives and non-derivatives designated as hedging instruments Balance Sheet Classification Foreign currency exchange contracts Other current assets $ 1,783 $ 5,185 Cross currency swaps Other current assets — 8,135 Interest rate swap contract Other long-term assets 1,451 — Cross currency swaps Other long-term assets 664 1,127 Total derivative instruments presented as hedge instruments on the balance sheet 3,898 14,447 Gross amounts subject to master netting arrangements not offset on the balance sheet (1,783) (3,210) Net amount $ 2,115 $ 11,237 (in thousands) Hedging Liabilities December 31, 2023 December 31, 2022 Derivatives and non-derivatives designated as hedging instruments Balance Sheet Classification Foreign currency exchange contracts Accrued liabilities $ 5,532 $ 4,572 Cross currency swaps Other long-term liabilities 5,041 — Total derivative instruments presented as cash flow hedges on the balance sheet 10,573 4,572 Non-derivative foreign currency denominated debt designated as net investment hedge on the balance sheet (1) Long-term debt 98,187 94,775 Total hedging instruments presented on the balance sheet 108,760 99,347 Gross amounts subject to master netting arrangements not offset on the balance sheet (1,783) (3,210) Net amount $ 106,977 $ 96,137 (1) Amounts represent reported carrying amounts of our foreign currency denominated debt. Refer to “Note 18. Fair Value Measurements” for information regarding the fair value of our long-term debt.

REPURCHASES OF COMMON STOCK (Ta

REPURCHASES OF COMMON STOCK (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Schedule of Common Stock Repurchases	The following is a summary of our open market common stock repurchases, reported on a trade date basis, and shares acquired through employee surrenders: (in thousands, except per share amounts) For the Years Ended December 31, 2023 2022 2021 Shares repurchased in the open market 155 1,963 1,283 Shares acquired through employee surrenders for statutory tax withholding 20 21 29 Total shares repurchased 175 1,984 1,312 Cost of shares repurchased in the open market $ 72,639 $ 810,942 $ 755,545 Cost of shares for employee surrenders 9,974 10,606 15,562 Total cost of shares $ 82,613 $ 821,548 $ 771,107 Average cost per share - open market repurchases $ 468.84 $ 413.12 $ 588.58 Average cost per share - employee surrenders $ 503.28 $ 501.89 $ 548.08 Average cost per share - total $ 472.74 $ 414.06 $ 587.70

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)	12 Months Ended
	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income	The changes in AOCI, net of tax, consisted of the following: For the Years Ended December 31, 2023 and 2022 Unrealized Gain (Loss) on Cash Flow Hedges, Net of Tax Unrealized Gain (Loss) on Net Investment Hedges, Net of Tax (in thousands) Unrealized (Loss) Gain on Investments, Net of Tax Foreign Currency Exchange Contracts Interest Rate Swap Euro-Denominated Notes Cross Currency Swaps Defined Benefit Plans, Net of Tax Cumulative Translation Adjustment Total Balance as of December 31, 2021 $ (126) $ 4,979 $ — $ 422 $ 3,240 $ — $ (61,999) $ (53,484) Other comprehensive (loss) income before reclassifications (46) 14,851 — 4,525 3,817 (3,282) (25,692) (5,827) Amounts reclassified from accumulated other comprehensive income — (18,991) — — — 506 — (18,485) Balance as of December 31, 2022 (172) 839 — 4,947 7,057 (2,776) (87,691) (77,796) Other comprehensive income (loss) before reclassifications 8 (792) 3,131 (2,601) (5,629) (1,302) 17,725 10,540 Amounts reclassified from accumulated other comprehensive income — (2,444) (2,025) — — 519 — (3,950) Balance as of December 31, 2023 $ (164) $ (2,397) $ 1,106 $ 2,346 $ 1,428 $ (3,559) $ (69,966) $ (71,206)
Summary of Reclassifications Out of Other Comprehensive Income	The following table presents components and amounts reclassified out of AOCI to net income: (in thousands) Affected Line Item in the Statements of Income Amounts Reclassified from AOCI for the Years Ended December 31, 2023 2022 2021 Foreign currency exchange contracts Cost of revenue $ 3,512 $ 25,733 $ (7,121) Tax (expense) benefit (1,068) (6,742) 1,347 Gains (losses), net of tax $ 2,444 $ 18,991 $ (5,774) Interest rate swap contract Interest expense $ 2,656 $ — $ — Tax (expense) (631) — — Gain, net of tax $ 2,025 $ — $ — Defined benefit plans Cost of revenue and operating expenses $ (630) $ (605) $ — Tax benefit 111 99 — (Losses), net of tax $ (519) $ (506) $ —

IDEXX RETIREMENT AND INCENTIV_2

IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN (Tables)	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Schedule of Future Benefits Expected to be Paid	Future benefits expected to be paid as of December 31, 2023, are as follows: (in thousands) December 31, 2024 $ 829 2025 $ 1,154 2026 $ 1,035 2027 $ 1,087 2028 $ 1,090 2029 through 2033 $ 6,405

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Restricted cash	$ 0	$ 0
Capitalized costs	0	0	$ 0
Advertising costs	4,200,000	5,000,000	3,300,000
Foreign currency losses	(1,100,000)	(3,400,000)	$ (2,100,000)
Equity investment, cost	$ 30,300,000	$ 30,300,000

REVENUE (Revenue Recognition) (

REVENUE (Revenue Recognition) (Details)	12 Months Ended
	Dec. 31, 2023
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
General payment terms	30 days
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
General payment terms	60 days

REVENUE (Disaggregation of Reve

REVENUE (Disaggregation of Revenue by Major Product and Service Categories) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,660,953	$ 3,367,324	$ 3,215,360
CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	3,352,356	3,058,793	2,889,960
Water segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	168,149	155,720	146,505
LPD segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	121,659	122,607	135,887
Other segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	18,789	30,204	43,008
CAG Diagnostics recurring revenue: | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	2,935,425	2,660,280	2,534,562
IDEXX VetLab consumables | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,188,261	1,057,236	1,006,781
Rapid assay products | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	344,494	313,667	296,852
Reference laboratory diagnostic and consulting services | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,278,617	1,178,113	1,123,656
CAG Diagnostics services and accessories | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	124,053	111,264	107,273
CAG Diagnostics capital - instruments | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	137,603	147,326	149,140
Veterinary software, services and diagnostic imaging systems: | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	279,328	251,187	206,258
Recurring revenue | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	214,597	180,973	147,498
Systems and hardware | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 64,731	$ 70,214	$ 58,760

REVENUE (Disaggregation of Re_2

REVENUE (Disaggregation of Revenue by Principal Geographic Area, Based on Customers' Domiciles) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,660,953	$ 3,367,324	$ 3,215,360
Americas
Disaggregation of Revenue [Line Items]
Total revenue	2,625,460	2,400,737	2,202,033
United States
Disaggregation of Revenue [Line Items]
Total revenue	2,391,427	2,182,959	1,995,683
Canada
Disaggregation of Revenue [Line Items]
Total revenue	150,110	142,743	139,727
Latin America & Caribbean
Disaggregation of Revenue [Line Items]
Total revenue	83,923	75,035	66,623
Europe, the Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenue	716,184	647,034	681,949
Germany
Disaggregation of Revenue [Line Items]
Total revenue	149,789	137,876	146,762
United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	121,745	110,400	114,955
France
Disaggregation of Revenue [Line Items]
Total revenue	96,797	84,479	90,836
Italy
Disaggregation of Revenue [Line Items]
Total revenue	53,787	48,192	52,062
Spain
Disaggregation of Revenue [Line Items]
Total revenue	52,332	46,982	48,169
Switzerland
Disaggregation of Revenue [Line Items]
Total revenue	34,830	30,646	31,984
Netherlands
Disaggregation of Revenue [Line Items]
Total revenue	30,508	26,882	29,656
Other
Disaggregation of Revenue [Line Items]
Total revenue	176,396	161,577	167,525
Asia Pacific Region
Disaggregation of Revenue [Line Items]
Total revenue	319,309	319,553	331,378
Australia
Disaggregation of Revenue [Line Items]
Total revenue	95,465	96,408	94,414
Japan
Disaggregation of Revenue [Line Items]
Total revenue	75,569	77,661	84,275
China
Disaggregation of Revenue [Line Items]
Total revenue	44,168	49,193	63,166
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 104,107	$ 96,291	$ 89,523

REVENUE (Product and Service Te

REVENUE (Product and Service Terms) (Details)	12 Months Ended
	Dec. 31, 2023
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
SaaS subscription, term	2 years
Extended warranties and post contract support
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Post-contract support contract, term	12 months
Extended warranties and post contract support | Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Extended product warranty, term	1 year
Extended warranties and post contract support | Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Extended product warranty, term	5 years

REVENUE (Free or Discounted Ins

REVENUE (Free or Discounted Instruments and Systems) (Details) - Free or discounted instruments and systems - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Commitment contract assets	$ 223.1	$ 190.8
Commitment contract assets reclassified to accounts receivable	$ 43.2

REVENUE (Up-Front Consideration

REVENUE (Up-Front Consideration Paid to Customers) (Details) - Customer commitment arrangements, multi-year arrangements - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Capitalized consideration paid to customers	$ 168.9	$ 158
Capitalized consideration paid to customers recognized as a reduction of revenue	$ 50.9

REVENUE (Rebate Arrangements) (

REVENUE (Rebate Arrangements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Rebate and up-front considerations arrangements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue	$ 32.9	$ 36.1
Deferred revenue recognized	12.6
Customer commitment arrangements, multi-year arrangements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimation of future revenues	$ 3,800

REVENUE (Remaining Performance

REVENUE (Remaining Performance Obligation) (Details)	Dec. 31, 2023
Rebate and up-front considerations arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	33%
Revenue recognition period	1 year
Rebate and up-front considerations arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	26%
Revenue recognition period	1 year
Rebate and up-front considerations arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	19%
Revenue recognition period	1 year
Rebate and up-front considerations arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	13%
Revenue recognition period	1 year
Rebate and up-front considerations arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	9%
Revenue recognition period
Customer commitment arrangements, multi-year arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	28%
Revenue recognition period	1 year
Customer commitment arrangements, multi-year arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	24%
Revenue recognition period	1 year
Customer commitment arrangements, multi-year arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	20%
Revenue recognition period	1 year
Customer commitment arrangements, multi-year arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	15%
Revenue recognition period	1 year
Customer commitment arrangements, multi-year arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	13%
Revenue recognition period
Reagent rental arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	26%
Revenue recognition period	1 year
Reagent rental arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	23%
Revenue recognition period	1 year
Reagent rental arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	18%
Revenue recognition period	1 year
Reagent rental arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	15%
Revenue recognition period	1 year
Reagent rental arrangements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	18%
Revenue recognition period
Extended warranties and post contract support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	43%
Revenue recognition period	1 year
Extended warranties and post contract support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	29%
Revenue recognition period	1 year
Extended warranties and post contract support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	16%
Revenue recognition period	1 year
Extended warranties and post contract support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	7%
Revenue recognition period	1 year
Extended warranties and post contract support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue percentage expected to be recognized (percent)	5%
Revenue recognition period

REVENUE (Instrument Rental Arra

REVENUE (Instrument Rental Arrangements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Lease revenue	$ 20.7	$ 20.3	$ 20.8

REVENUE (Reagent Rental Arrange

REVENUE (Reagent Rental Arrangements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reagent rental arrangements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimation of future revenues	$ 56.4
Sales-type reagent rental arrangements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Lease receivable asset	23.1	$ 18.4
Lease receivable, reclassified to receivable	4.3
Operating-type reagent rental arrangements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Instruments transferred to property and equipment	$ 14.6	$ 17.4

REVENUE (Deferred Extended Warr

REVENUE (Deferred Extended Warranties and Post-Contract Support Revenue) (Details) - Extended warranties and post contract support - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue	$ 26	$ 26.4
Deferred revenue recognized	19.8
Estimation of future revenues	$ 9.7

REVENUE (Costs to Obtain a Cont

REVENUE (Costs to Obtain a Contract) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred commission costs	$ 19.7	$ 19.2
Commissions expense recognized	$ 6.5
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Amortization period	3 years
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Amortization period	7 years

ACQUISITIONS, ASSET PURCHASES_2

ACQUISITIONS, ASSET PURCHASES AND INVESTMENTS (Details) $ in Thousands		3 Months Ended						12 Months Ended
	Feb. 01, 2024 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) arrangement	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Investment acquired, non-controlling interest share								$ 0	$ 25,000	$ 0
Goodwill				$ 359,345				$ 365,961	361,795	359,345	$ 243,347
Noncontrolling interest, remaining percentage purchased from noncontrolling owners (percent)				5%
Acquisition of noncontrolling interest				$ 1,000					$ 0	990
Noncompete agreements | Maximum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life								5 years
International Water Testing Company | Canada
Business Acquisition [Line Items]
Payments to acquire business			$ 12,800
Goodwill			$ 6,900
International Water Testing Company | Canada | Technology-based intangible assets
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life			10 years
Net tangible assets			$ 3,400
International Water Testing Company | Canada | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life			10 years
Net tangible assets			$ 1,200
International Water Testing Company | Canada | New tangible assets
Business Acquisition [Line Items]
Net tangible assets			1,300
Reference Laboratory | Finland
Business Acquisition [Line Items]
Payments to acquire business				13,400
Holdback			$ 1,300	1,400						1,400
Goodwill				6,900						6,900
Liabilities				$ 1,700						$ 1,700
Reference Laboratory | Finland | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life				10 years						10 years
Net tangible assets				$ 7,400						$ 7,400
Reference Laboratory | Finland | Noncompete agreements
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life				3 years						3 years
Net tangible assets				$ 800						$ 800
Reference Laboratory | Switzerland
Business Acquisition [Line Items]
Goodwill							$ 1,800
Liabilities							600
Consideration transferred							5,500
Contingent payment and holdback							$ 1,100
Reference Laboratory | Switzerland | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life							9 years
Intangible assets acquired							$ 4,300
Teleradiology Business
Business Acquisition [Line Items]
Goodwill					$ 3,700
Consideration transferred					5,400
Contingent consideration					300
Teleradiology Business | Customer relationships
Business Acquisition [Line Items]
Net tangible assets					$ 1,700
Weighted average useful life of intangible assets					10 years
EzyVet Cloud-based Veterinary
Business Acquisition [Line Items]
Net tangible assets						$ 3,200
Goodwill						109,400
Consideration transferred						157,200
Contingent consideration				7,000		5,000				$ 7,000
Change in amount of contingent payable				2,000
Acquisition expenses				$ 2,200
EzyVet Cloud-based Veterinary | IDEXX VetLab consumables
Business Acquisition [Line Items]
Goodwill						23,400
EzyVet Cloud-based Veterinary | Reference laboratory diagnostic and consulting services
Business Acquisition [Line Items]
Goodwill						27,000
EzyVet Cloud-based Veterinary | Rapid assay products
Business Acquisition [Line Items]
Goodwill						11,100
EzyVet Cloud-based Veterinary | Veterinary software, services and diagnostic imaging systems:
Business Acquisition [Line Items]
Goodwill						47,900
EzyVet Cloud-based Veterinary | Technology-based intangible assets
Business Acquisition [Line Items]
Net tangible assets						$ 8,400
Weighted average useful life of intangible assets						6 years
EzyVet Cloud-based Veterinary | Customer relationships
Business Acquisition [Line Items]
Net tangible assets						$ 32,000
Weighted average useful life of intangible assets						10 years
EzyVet Cloud-based Veterinary | Noncompete agreements
Business Acquisition [Line Items]
Net tangible assets						$ 1,800
Weighted average useful life of intangible assets						5 years
EzyVet Cloud-based Veterinary | Trademarks
Business Acquisition [Line Items]
Net tangible assets						$ 2,400
Weighted average useful life of intangible assets						14 years
License Intellectual Property Rights
Business Acquisition [Line Items]
Number of arrangements related to license intellectual property | arrangement									2
Payments to acquire productive assets		$ 15,000							$ 65,000
Payable to acquire productive assets									15,000
Perpetual Intellectual Property License
Business Acquisition [Line Items]
Payments to acquire productive assets									$ 10,000
Finite-lived intangible asset, useful life									10 years
Assets Of A Privately Owned Software And Data Platform Business | Subsequent Event
Business Acquisition [Line Items]
Consideration transferred	$ 77,000
Contingent payment period	3 years
Assets Of A Privately Owned Software And Data Platform Business | Subsequent Event | Maximum
Business Acquisition [Line Items]
Contingent payments	$ 30,000

SHARE-BASED COMPENSATION (Narra

SHARE-BASED COMPENSATION (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2019	Dec. 31, 2018 shares	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding | $	$ 60.2
Weighted average recognition period for unrecognized compensation expense, in years	1 year 3 months 18 days
Intrinsic value of stock options exercised | $	$ 75.5	$ 54.6	$ 147.9
Nonvested, intrinsic value | $	$ 78
Number of unissued shares of common stock each DSU represents right to receive (in shares)						1
Deferred stock units, outstanding (in shares)	59,000	58,000
2018 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant under share-based incentive plans (in shares)					7,500,000
Shares available for grant under share-based incentive plans (in shares)	6,100,000
Stock options and stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio of shares issued under share-based awards to shares authorized under stock plans					1
Awards other than stock options and stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio of shares issued under share-based awards to shares authorized under stock plans					2.4
Stock options granted to employees with ratable vesting | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Stock options granted to employees with ratable vesting | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional vesting period				2 years
Contractual term				10 years
Award vesting rights, percentage (percent)				25%
Fair value of options vested during period | $	$ 22.5	$ 20.4	17.3
Restricted stock units granted to employees with ratable vesting | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Restricted stock units granted to employees with ratable vesting | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Restricted stock units granted to employees with ratable vesting | Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional vesting period				2 years
Award vesting rights, percentage (percent)				25%
Fair value of awards vested during period | $	$ 31.1	$ 32.9	$ 46.1
Vested (in shares)	62,000
Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred stock units, outstanding (in shares)	59,000	58,000
Vested (in shares)	300,000
1997 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant under share-based incentive plans (in shares)	4,700,000
Shares available for grant under share-based incentive plans (in shares)	1,000,000
Discount from market value for employee stock purchase rights (percent)	15%
Common stock issued in connection with the employee stock purchase plan (in shares)	36,300	44,600	29,500

SHARE-BASED COMPENSATION (Sched

SHARE-BASED COMPENSATION (Schedule of Selected Financial Impact of Share-Based Compensation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 59,739	$ 49,770	$ 37,755
Income tax benefit resulting from share-based compensation expense	(5,487)	(4,658)	(4,734)
Net share-based compensation expense included in consolidated statements of income, excluding tax benefit from settlement of share-based awards	54,252	45,112	33,021
Income tax benefit resulting from settlement of share-based awards	(13,703)	(12,522)	(32,474)
Net expense related to share-based compensation arrangements included in consolidated statements of income	40,549	32,590	547
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	5,643	4,638	4,044
Operating expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 54,096	$ 45,132	$ 33,711

SHARE-BASED COMPENSATION (Sch_2

SHARE-BASED COMPENSATION (Schedule of Weighted Averages of the Assumptions Used In Estimating the Fair Value of Stock Option Awards) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Expected stock price volatility	32%	30%	30%
Expected term, in years	6 years 8 months 12 days	6 years 4 months 24 days	6 years 2 months 12 days
Risk-free interest rate	3.70%	2.10%	0.70%
Weighted average fair value of options granted (in USD per shares)	$ 201.48	$ 166.30	$ 169.15

SHARE-BASED COMPENSATION (Sch_3

SHARE-BASED COMPENSATION (Schedule of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Number of Options
Outstanding, at beginning of year (in shares) | shares	1,701
Granted (in shares) | shares	142
Exercised (in shares) | shares	(215)
Forfeited (in shares) | shares	(26)
Expired (in shares) | shares	(6)
Outstanding, at end of year (in shares) | shares	1,596
Fully vested, at end of year (in shares) | shares	1,209
Fully vested and expected to vest, at end of year (in shares) | shares	1,581
Weighted Average Exercise Price
Weighted average exercise price of beginning balance of options outstanding (in USD per share) | $ / shares	$ 219.90
Weighted average exercise price of options granted (in USD per share) | $ / shares	503.50
Weighted average exercise price of options exercised (in USD per share) | $ / shares	147.69
Weighted average exercise price of options forfeited (in USD per share) | $ / shares	432.43
Weighted average exercise price of options expired (in USD per share) | $ / shares	545.55
Weighted average exercise price of ending balance of options outstanding (in USD per share) | $ / shares	250.14
Weighted average exercise price of options fully vested (in USD per share) | $ / shares	186.45
Weighted average exercise price of options fully vested and expected to vest (in USD per share) | $ / shares	$ 247.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term of ending balance of options outstanding	4 years 9 months 18 days
Weighted average remaining contractual term of options fully vested	3 years 10 months 24 days
Weighted average remaining contractual term of options fully vested and expected to vest	4 years 9 months 18 days
Aggregate intrinsic value | $	$ 487,487
Aggregate intrinsic value of options fully vested | $	446,109
Aggregate intrinsic value of options expected to vest | $	$ 486,636

SHARE-BASED COMPENSATION (Sch_4

SHARE-BASED COMPENSATION (Schedule Of Restricted Stock Unit Activity) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Restricted stock units (RSU's)
Number of Units
Nonvested, at beginning of year (in shares)	148
Granted (in shares)	63
Vested (in shares)	(62)
Forfeited (in shares)	(8)
Nonvested, at end of year (in shares)	141
Weighted Average Grant-Date Fair Value
Weighted average grant date fair value, at beginning of year (in USD per share) | $ / shares	$ 391.55
Weighted average grant date fair value, end of year (in USD per share) | $ / shares	$ 459.11
Restricted stock units expected to vest reduced for estimated forfeitures
Number of Units
Nonvested, at end of year (in shares)	134
Weighted Average Grant-Date Fair Value
Weighted average grant date fair value, end of year (in USD per share) | $ / shares	$ 457.51

CREDIT LOSSES (Details)

CREDIT LOSSES (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounts receivable allowance for credit losses	$ 9.5	$ 8.3
Percent of accounts receivable not past due (percent)	83%	86%
Percent of accounts receivable past due (percent)	17%	14%
Accounts receivable, noncurrent, threshold period past due	60 days	60 days
Reserve for contract assets and sales-type leases	$ 6.4	$ 5.5
Greater than 60 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Percent of accounts receivable past due (percent)	1.70%	2%

INVENTORIES (Narrative) (Detail

INVENTORIES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Inventory [Line Items]
Unpaid inventory	$ 58,900	$ 59,400	$ 64,400
Reagent rental arrangements
Inventory [Line Items]
Amount of rental and operating-type reagent rental program instruments transferred from inventory to property and equipment	$ 14,608	$ 17,407	$ 11,628

INVENTORIES (Schedule of Compon

INVENTORIES (Schedule of Components of Inventories) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventory, Net [Abstract]
Raw materials	$ 106,392	$ 92,796
Work-in-process	28,989	28,041
Finished goods	244,901	246,986
Inventories	$ 380,282	$ 367,823

LEASES (Narrative) (Details)

LEASES (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Rent expense, excluding variable and short-term expenses	$ 29.1	$ 26.8
Total rent expense including variable rent and short-term expenses	$ 31.7	$ 28.7
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, termination period	1 year

LEASES (Maturities of Operating

LEASES (Maturities of Operating Lease Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
2024	$ 24,231
2025	23,478
2026	21,030
2027	16,138
2028	11,981
Thereafter	43,698
Total lease payments	140,556
Less imputed interest	(21,083)
Total lease liabilities (current and long-term)	$ 119,473
Weighted average remaining lease term - operating leases	8 years 10 months 24 days	9 years 8 months 12 days
Weighted average discount rate - operating leases	4%	3.50%

LEASES (Supplemental Cash Flow

LEASES (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 27,525	$ 24,973
Right-of-use assets obtained in exchange for operating lease obligations, net of early lease terminations	$ 19,443	$ 36,817

PROPERTY AND EQUIPMENT, NET (Sc

PROPERTY AND EQUIPMENT, NET (Schedule of Estimated Useful Lives) (Details)	Dec. 31, 2023
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	8 years
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Computer hardware and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer hardware and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years

PROPERTY AND EQUIPMENT, NET (_2

PROPERTY AND EQUIPMENT, NET (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Gross amount	$ 1,486,994	$ 1,355,388
Less accumulated depreciation and amortization	784,817	705,914
Total property and equipment, net	702,177	649,474
Land and improvements
Property, Plant and Equipment [Line Items]
Gross amount	22,400	22,221
Buildings and improvements
Property, Plant and Equipment [Line Items]
Gross amount	432,038	356,049
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross amount	116,347	107,251
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross amount	431,914	404,963
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Gross amount	78,941	71,625
Computer hardware and software
Property, Plant and Equipment [Line Items]
Gross amount	326,295	295,969
Construction in progress
Property, Plant and Equipment [Line Items]
Gross amount	$ 79,059	$ 97,310

PROPERTY AND EQUIPMENT, NET (Su

PROPERTY AND EQUIPMENT, NET (Summary Of Depreciation And Amortization, Capitalized Computer Software For Internal Use And Unpaid Property Equipment Reflected In Account Payable And Accrued Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 100,994	$ 96,746	$ 92,376
Unpaid property and equipment, reflected in accounts payable and accrued liabilities at end of year	12,061	18,334	19,326
Reagent rental arrangements
Property, Plant and Equipment [Line Items]
Amount of rental and operating-type reagent rental program instruments transferred from inventory to property and equipment	14,608	17,407	11,628
Capitalization of internal-use software development costs during the period
Property, Plant and Equipment [Line Items]
Capitalization of internal-use software development costs during the period	$ 37,120	$ 20,329	$ 14,753

PROPERTY AND EQUIPMENT, NET (Na

PROPERTY AND EQUIPMENT, NET (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Write-down of fixed assets	$ 0	$ 0	$ 5,100,000

OTHER CURRENT AND LONG-TERM A_3

OTHER CURRENT AND LONG-TERM ASSETS (Schedule of Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Assets, Noncurrent [Abstract]
Contract assets, net	$ 55,111	$ 41,854
Consideration paid to customers	54,081	50,776
Prepaid expenses	48,370	41,742
Taxes receivable	16,972	48,430
Other	29,061	37,687
Other current assets	$ 203,595	$ 220,489

OTHER CURRENT AND LONG-TERM A_4

OTHER CURRENT AND LONG-TERM ASSETS (Schedule Of Other Long-term Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Assets, Noncurrent [Abstract]
Contract assets, net	$ 167,963	$ 148,971
Consideration paid to customers	114,850	107,205
Deferred income taxes	107,364	55,215
Equity investments	30,250	30,250
Investment in long-term product supply arrangements	25,943	25,250
Other	50,164	50,838
Other long-term assets	$ 496,534	$ 417,729

GOODWILL AND INTANGIBLE ASSET_3

GOODWILL AND INTANGIBLE ASSETS, NET (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairments	$ 0	$ 0	$ 0
Intangible assets impairments	0	0	0
Aggregate amortization expense	$ 13,800,000	$ 15,000,000	$ 12,100,000

GOODWILL AND INTANGIBLE ASSET_4

GOODWILL AND INTANGIBLE ASSETS, NET (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 361,795	$ 359,345	$ 243,347
Business combinations	0	8,498	120,346
Impact of changes in foreign currency exchange rates	4,166	(6,048)	(4,348)
Ending balance	365,961	361,795	359,345
CAG
Goodwill [Roll Forward]
Beginning balance	323,482	327,171	210,394
Business combinations	0	1,641	120,346
Impact of changes in foreign currency exchange rates	2,740	(5,330)	(3,569)
Ending balance	326,222	323,482	327,171
Water
Goodwill [Roll Forward]
Beginning balance	17,899	11,939	12,023
Business combinations	0	6,857	0
Impact of changes in foreign currency exchange rates	321	(897)	(84)
Ending balance	18,220	17,899	11,939
LPD
Goodwill [Roll Forward]
Beginning balance	13,883	13,704	14,399
Business combinations	0	0	0
Impact of changes in foreign currency exchange rates	1,105	179	(695)
Ending balance	14,988	13,883	13,704
Other
Goodwill [Roll Forward]
Beginning balance	6,531	6,531	6,531
Business combinations	0	0	0
Impact of changes in foreign currency exchange rates	0	0	0
Ending balance	$ 6,531	$ 6,531	$ 6,531

GOODWILL AND INTANGIBLE ASSET_5

GOODWILL AND INTANGIBLE ASSETS, NET (Schedule of Estimated Useful Lives For Intangible Assets) (Details)	Dec. 31, 2023
Customer-related intangible assets | Minimum
Property, Plant and Equipment [Line Items]
Intangible assets, estimated useful life	3 years
Customer-related intangible assets | Maximum
Property, Plant and Equipment [Line Items]
Intangible assets, estimated useful life	17 years
Product rights | Minimum
Property, Plant and Equipment [Line Items]
Intangible assets, estimated useful life	5 years
Product rights | Maximum
Property, Plant and Equipment [Line Items]
Intangible assets, estimated useful life	15 years
Noncompete agreements | Minimum
Property, Plant and Equipment [Line Items]
Intangible assets, estimated useful life	3 years
Noncompete agreements | Maximum
Property, Plant and Equipment [Line Items]
Intangible assets, estimated useful life	5 years

GOODWILL AND INTANGIBLE ASSET_6

GOODWILL AND INTANGIBLE ASSETS, NET (Schedule of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Cost	$ 133,546	$ 138,719
Accumulated Amortization	49,046	41,047
Net	84,500	97,672
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Cost	102,217	104,111
Accumulated Amortization	37,782	30,952
Net	64,435	73,159
Product rights
Finite-Lived Intangible Assets [Line Items]
Cost	27,317	30,176
Accumulated Amortization	8,606	8,039
Net	18,711	22,137
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	4,012	4,432
Accumulated Amortization	2,658	2,056
Net	$ 1,354	$ 2,376

GOODWILL AND INTANGIBLE ASSET_7

GOODWILL AND INTANGIBLE ASSETS, NET (Schedule of Expected Amortization Expense) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 12,834
2025	12,097
2026	11,835
2027	10,522
2028	9,204
Thereafter	28,008
Net	$ 84,500	$ 97,672

ACCOUNTS PAYABLE, ACCRUED LIA_3

ACCOUNTS PAYABLE, ACCRUED LIABILITIES AND OTHER LONG-TERM LIABILITIES (Schedule of Supplier Financing Program) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Supplier Finance Program, Obligation [Roll Forward]
Payment obligations outstanding at the beginning of the period	$ 10,171	$ 4,775
Supplier finance program, obligation, statement of financial position [extensible enumeration]	Accounts payable	Accounts payable
Payment obligation additions during the period	$ 45,765	$ 58,936
Payment obligations settled during the period	(46,878)	(53,540)
Payment obligations outstanding at the end of the period	$ 9,057	$ 10,171

ACCOUNTS PAYABLE, ACCRUED LIA_4

ACCOUNTS PAYABLE, ACCRUED LIABILITIES AND OTHER LONG-TERM LIABILITIES (Schedule of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accrued Liabilities, Current [Abstract]
Accrued employee compensation and related expenses	$ 174,375	$ 142,994
Accrued expenses	113,596	149,446
Accrued taxes	86,553	48,547
Accrued customer incentives and refund obligations	84,386	72,250
Current lease liabilities	$ 19,802	$ 20,425
Operating lease, liability, current, statement of financial position [extensible enumeration]	Accrued liabilities	Accrued liabilities
Accrued liabilities	$ 478,712	$ 433,662

ACCOUNTS PAYABLE, ACCRUED LIA_5

ACCOUNTS PAYABLE, ACCRUED LIABILITIES AND OTHER LONG-TERM LIABILITIES (Schedule Of Other Long-term Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accrued Liabilities, Current [Abstract]
Accrued taxes	$ 39,642	$ 49,142
Other accrued long-term expenses	25,884	18,445
Other long-term liabilities	$ 65,526	$ 67,587

DEBT (Narrative) (Details)

DEBT (Narrative) (Details)

12 Months Ended

Oct. 20, 2022 USD ($)

Feb. 12, 2022 USD ($)

Jul. 31, 2021 USD ($)

Dec. 19, 2014 USD ($)

Dec. 31, 2023 USD ($)

Dec. 31, 2022 USD ($)

Dec. 31, 2021 USD ($)

Dec. 31, 2023 EUR (€)

Mar. 31, 2023 USD ($)

Apr. 14, 2020 USD ($)

Apr. 10, 2020 USD ($) amendement

Apr. 02, 2020 USD ($)

Mar. 23, 2020 USD ($)

Mar. 22, 2020 USD ($)

Mar. 14, 2019 USD ($)

Jun. 30, 2015 EUR (€)

Sep. 30, 2014 USD ($)

Jul. 31, 2014 USD ($)

Dec. 31, 2013 USD ($)

Line of Credit Facility [Line Items]

Outstanding credit facility balance

$ 250,000,000

$ 579,000,000

Repayments of senior debt

75,000,000

75,000,000

$ 50,000,000

Interest paid

$ 41,000,000

40,300,000

$ 30,500,000

Term Loan

Line of Credit Facility [Line Items]

Borrowing capacity option amount

$ 1,500,000,000

Senior Notes

Line of Credit Facility [Line Items]

Consolidated leverage ratio under credit facility & note payable, maximum

0.035

Number of amendments | amendement

2

Senior Notes | 2023 Series A Notes and 2025 Series B Notes

Line of Credit Facility [Line Items]

Face amount

$ 150,000,000

Senior Notes | 2023 Series A Notes

Line of Credit Facility [Line Items]

Face amount

$ 75,000,000

Stated interest rate (percent)

3.94%

Repayments of senior debt

$ 75,000,000

Senior Notes | 2025 Series B Notes

Line of Credit Facility [Line Items]

Face amount

$ 75,000,000

$ 75,000,000

Stated interest rate (percent)

4.04%

4.04%

4.04%

Senior Notes | 2026 Senior Notes

Line of Credit Facility [Line Items]

Face amount

$ 75,000,000

$ 75,000,000

Stated interest rate (percent)

3.72%

3.72%

3.72%

Senior Notes | 2021 Series A Notes and 2024 Series B Notes

Line of Credit Facility [Line Items]

Face amount

$ 125,000,000

Senior Notes | 2021 Series A Notes

Line of Credit Facility [Line Items]

Face amount

$ 50,000,000

Stated interest rate (percent)

3.32%

Repayments of senior debt

$ 50,000,000

Senior Notes | 2024 Series B Notes

Line of Credit Facility [Line Items]

Face amount

$ 75,000,000

$ 75,000,000

Stated interest rate (percent)

3.76%

3.76%

3.76%

Senior Notes | 2025 Series C Notes

Line of Credit Facility [Line Items]

Face amount | €

€ 88,857,000

€ 88,900,000

Stated interest rate (percent)

1.785%

1.785%

1.785%

Senior Notes | Prudential 2030 Series D Notes

Line of Credit Facility [Line Items]

Borrowing capacity

$ 425,000,000

Face amount

$ 75,000,000

$ 75,000,000

Stated interest rate (percent)

2.50%

2.50%

2.50%

Senior Notes | 2022 Series A Notes and 2027 Series B Notes

Line of Credit Facility [Line Items]

Face amount

$ 150,000,000

Senior Notes | 2022 Series A Notes

Line of Credit Facility [Line Items]

Debt instrument, term

7 years

Face amount

$ 75,000,000

Stated interest rate (percent)

3.25%

Repayments of senior debt

$ 75,000,000

Senior Notes | 2027 Series B Notes

Line of Credit Facility [Line Items]

Debt instrument, term

12 years

Face amount

$ 75,000,000

$ 75,000,000

Stated interest rate (percent)

3.72%

3.72%

3.72%

Senior Notes | 2029 Series C Notes

Line of Credit Facility [Line Items]

Face amount

$ 100,000,000

$ 100,000,000

Stated interest rate (percent)

4.19%

4.19%

4.19%

Senior Notes | MetLife 2030 Series D Notes

Line of Credit Facility [Line Items]

Borrowing capacity

$ 300,000,000

$ 150,000,000

Face amount

$ 125,000,000

$ 125,000,000

Stated interest rate (percent)

2.50%

2.50%

2.50%

Revolving Credit Facility

Line of Credit Facility [Line Items]

Outstanding credit facility balance

$ 250,000,000

579,000,000

Stated interest rate (percent)

6%

6%

Credit facility weighted average interest rates on outstanding balance (percent)

3.10%

3.10%

Reduction of credit facility availability

$ 1,500,000

$ 1,500,000

Consolidated leverage ratio under credit facility & note payable, maximum

0.035

Revolving Credit Facility | Term Loan

Line of Credit Facility [Line Items]

Debt instrument, term

5 years

Borrowing capacity

$ 1,000,000,000

Principal amount

$ 250,000,000

Revolving Credit Facility, Individual Borrowings | Minimum

Line of Credit Facility [Line Items]

Debt instrument, term

1 day

Revolving Credit Facility, Individual Borrowings | Maximum

Line of Credit Facility [Line Items]

Debt instrument, term

180 days

Secured Debt | Term Loan

Line of Credit Facility [Line Items]

Face amount

$ 250,000,000

$ 250,000,000

Outstanding credit facility balance

$ 250,000,000

Secured Debt | Term Loan | Prime Rate | Minimum

Line of Credit Facility [Line Items]

Credit spread during period (percent)

0%

Secured Debt | Term Loan | Prime Rate | Maximum

Line of Credit Facility [Line Items]

Credit spread during period (percent)

0.375%

Secured Debt | Term Loan | Secured Overnight Financing Rate (SOFR)

Line of Credit Facility [Line Items]

Credit spread during period (percent)

0.10%

Secured Debt | Term Loan | Secured Overnight Financing Rate (SOFR) | Minimum

Line of Credit Facility [Line Items]

Basis spread on variable rate, additional (percent)

0.875%

Secured Debt | Term Loan | Secured Overnight Financing Rate (SOFR) | Maximum

Line of Credit Facility [Line Items]

Basis spread on variable rate, additional (percent)

1.375%

Secured Debt | Term Loan | Daily Secured Overnight Financing Rate (SOFR)

Line of Credit Facility [Line Items]

Credit spread during period (percent)

0.10%

Secured Debt | Term Loan | Daily Secured Overnight Financing Rate (SOFR) | Minimum

Line of Credit Facility [Line Items]

Basis spread on variable rate, additional (percent)

0.875%

Secured Debt | Term Loan | Daily Secured Overnight Financing Rate (SOFR) | Maximum

Line of Credit Facility [Line Items]

Basis spread on variable rate, additional (percent)

1.375%

DEBT (Schedule of Current Senio

DEBT (Schedule of Current Senior Notes Outstanding) (Details) - Senior Notes	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)	Apr. 14, 2020 USD ($)	Apr. 02, 2020 USD ($)	Mar. 14, 2019 USD ($)	Jun. 30, 2015 EUR (€)	Dec. 19, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jul. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
2025 Series B Notes
Debt Instrument [Line Items]
Principal Amount	$ 75,000,000									$ 75,000,000
Coupon Rate	4.04%	4.04%								4.04%
2026 Senior Notes
Debt Instrument [Line Items]
Principal Amount	$ 75,000,000							$ 75,000,000
Coupon Rate	3.72%	3.72%						3.72%
2024 Series B Notes
Debt Instrument [Line Items]
Principal Amount	$ 75,000,000								$ 75,000,000
Coupon Rate	3.76%	3.76%							3.76%
2025 Series C Notes
Debt Instrument [Line Items]
Principal Amount | €		€ 88,857,000				€ 88,900,000
Coupon Rate	1.785%	1.785%				1.785%
2027 Series B Notes
Debt Instrument [Line Items]
Principal Amount	$ 75,000,000						$ 75,000,000
Coupon Rate	3.72%	3.72%					3.72%
2029 Series C Notes
Debt Instrument [Line Items]
Principal Amount	$ 100,000,000				$ 100,000,000
Coupon Rate	4.19%	4.19%			4.19%
MetLife 2030 Series D Notes
Debt Instrument [Line Items]
Principal Amount	$ 125,000,000			$ 125,000,000
Coupon Rate	2.50%	2.50%		2.50%
Prudential 2030 Series D Notes
Debt Instrument [Line Items]
Principal Amount	$ 75,000,000		$ 75,000,000
Coupon Rate	2.50%	2.50%	2.50%

DEBT (Schedule of Future Maturi

DEBT (Schedule of Future Maturities of Long-Term Debt) (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Instruments [Abstract]
2024	$ 75,000
2025	173,187
2026	75,000
2027	75,000
2028	0
Thereafter	300,000
Total	$ 698,187

INCOME TAXES (Schedule of Earni

INCOME TAXES (Schedule of Earnings Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Domestic	$ 889,133	$ 684,661	$ 689,994
International	172,043	175,311	212,660
Income before provision for income taxes	$ 1,061,176	$ 859,972	$ 902,654

INCOME TAXES (Schedule of Compo

INCOME TAXES (Schedule of Components of Provision (Benefit) for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
Federal	$ 191,274	$ 150,099	$ 112,811
State	40,369	30,529	19,147
International	32,797	35,138	29,288
Provision for current income taxes	264,440	215,766	161,246
Deferred
Federal	(36,501)	(31,663)	(7,019)
State	(6,462)	(5,735)	(503)
International	(5,343)	2,515	4,086
Provision (benefit) for deferred income taxes	(48,306)	(34,883)	(3,436)
Provision for income taxes	$ 216,134	$ 180,883	$ 157,810

INCOME TAXES (Schedule of Effec

INCOME TAXES (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21%	21%	21%
State income tax, net of federal tax benefit	2.70%	2.30%	2.10%
Taxation on international earnings	(0.10%)	0.60%	(0.80%)
Foreign derived intangible income	(1.40%)	(1.70%)	(1.20%)
Share-based compensation from settlements	(1.30%)	(1.50%)	(3.60%)
Research and development credit	(1.20%)	(1.10%)	(0.70%)
Other, net	0.70%	1.40%	0.70%
Effective tax rate	20.40%	21%	17.50%

INCOME TAXES (Narrative) (Detai

INCOME TAXES (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Effective income tax rate (percent)	20.40%	21%	17.50%
Income taxes paid	$ 192.5	$ 239.8	$ 161.7
Income tax ruling exemption			21.4
Net operating loss carryforwards in certain state and international jurisdictions	39.3
Unrecognized tax benefits that would impact effective tax rate if recognized	21.2	20.9
Interest expense and penalties related to unrecognized tax benefits	2.9	1.3	1.1
Interest expense and penalties accrued	3.8	$ 4.2	$ 3.8
Unrecognized tax benefits, subject to expiration	$ 8.9

INCOME TAXES (Schedule of Com_2

INCOME TAXES (Schedule of Components of Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Accrued expenses	$ 44,043	$ 38,457
Accounts receivable reserves	2,700	2,447
Deferred revenue	6,427	4,671
Inventory basis differences	24,500	9,062
Property-based differences	18,036	20,157
Intangible asset basis differences	47,089	44,196
Share-based compensation	12,061	11,324
Other	2,267	1,273
Net operating loss carryforwards	9,007	8,956
Tax credit carryforwards	12,824	13,370
Unrealized losses on foreign currency exchange contracts and investments	821	227
Research and development expenditure differences	66,705	29,997
Total assets	246,480	184,137
Valuation allowance	(34,793)	(39,726)	$ (39,280)	$ (40,262)
Total assets, net of valuation allowance	211,687	144,411
Liabilities
Customer acquisition costs	(39,318)	(37,223)
Property-based differences	(52,235)	(44,295)
Intangible asset basis differences	(6,335)	(2,379)
Other	(11,639)	(8,958)
Unrealized gains on foreign currency exchange contracts and investments	(1,813)	(4,491)
Total liabilities	(111,340)	(97,346)
Net deferred tax assets	$ 100,347	$ 47,065

INCOME TAXES (Schedule of Valua

INCOME TAXES (Schedule of Valuation Allowance For Deferred Tax Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Balance at beginning of year	$ 39,726	$ 39,280	$ 40,262
Charges to costs and expense	21	2,200	1,464
Write-off/cash payments	(7,846)	(1,537)	(1,182)
Foreign currency translation	2,892	(217)	(1,264)
Balance at the end of the year	$ 34,793	$ 39,726	$ 39,280

INCOME TAXES (Schedule of Chang

INCOME TAXES (Schedule of Changes in Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total amounts of unrecognized tax benefits, beginning of period	$ 22,547	$ 21,789	$ 22,484
Gross increases in unrecognized tax positions as a result of tax positions taken during a prior period	6,366	342	443
Gross increases in unrecognized tax positions as a result of tax positions taken in the current period	3,987	3,197	2,414
Decreases in unrecognized tax positions related to settlements with taxing authorities	(7,535)	(1,544)	(537)
Decreases in unrecognized tax positions as a result of a lapse of the applicable statutes of limitations	(3,045)	(1,237)	(3,015)
Total amounts of unrecognized tax benefits, end of period	$ 22,320	$ 22,547	$ 21,789

EARNINGS PER SHARE (Schedule of

EARNINGS PER SHARE (Schedule of Reconciliation of Shares Outstanding for Basic and Diluted Earnings Per Share) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shares outstanding for basic earnings per share:
Shares outstanding for basic earnings per share (in shares)	83,066	83,623	85,200
Shares outstanding for diluted earnings per share:
Shares outstanding for basic earnings per share (in shares)	83,066	83,623	85,200
Dilutive effect of share-based payment awards (in shares)	912	977	1,372
Shares outstanding for diluted earnings per share (in shares)	83,978	84,600	86,572

EARNINGS PER SHARE (Schedule _2

EARNINGS PER SHARE (Schedule of Number of Anti-Dilutive Stock Options and Awards) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying anti-dilutive options (in shares)	381	263	121
Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying anti-dilutive options (in shares)	1	46	0

COMMITMENTS, CONTINGENCIES AN_2

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Details) - USD ($)	198 Months Ended
	Jun. 30, 2020	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Purchase obligations due in within year one		$ 196,300,000
Purchase obligations due in after year one		55,200,000
Damages sought	$ 50,000,000
Loss contingency accrual				$ 27,500,000
Liabilities for indemnification obligations		$ 0	$ 0

SEGMENT REPORTING (Narrative) (

SEGMENT REPORTING (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023 segment
Segment Reporting [Abstract]
Number of business segments	3

SEGMENT REPORTING (Summary of S

SEGMENT REPORTING (Summary of Segment Performance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 3,660,953	$ 3,367,324	$ 3,215,360
Income from operations	1,097,128	898,765	932,028
Interest expense, net	(35,952)	(38,793)	(29,374)
Income before provision for income taxes	1,061,176	859,972	902,654
Provision for income taxes	216,134	180,883	157,810
Net income	845,042	679,089	744,844
Less: Net (loss) attributable to noncontrolling interest	0	0	(1)
Net income attributable to IDEXX Laboratories, Inc. stockholders	845,042	679,089	744,845
Depreciation and amortization	114,908	111,900	104,596
CAG
Segment Reporting Information [Line Items]
Revenue	3,352,356	3,058,793	2,889,960
Income from operations	1,012,740	800,949	824,022
Depreciation and amortization	103,554	101,254	94,202
Water
Segment Reporting Information [Line Items]
Revenue	168,149	155,720	146,505
Income from operations	74,340	72,519	65,444
Depreciation and amortization	4,117	3,020	2,709
LPD
Segment Reporting Information [Line Items]
Revenue	121,659	122,607	135,887
Income from operations	9,975	19,809	28,636
Depreciation and amortization	3,657	3,797	3,908
Other
Segment Reporting Information [Line Items]
Revenue	18,789	30,204	43,008
Income from operations	73	5,488	13,926
Depreciation and amortization	$ 3,580	$ 3,829	$ 3,777

SEGMENT REPORTING (Schedule of

SEGMENT REPORTING (Schedule of Net Long-Lived Assets by Principal Geographic Areas) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 702,177	$ 649,474
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	572,003	520,046
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	531,735	486,690
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	33,236	25,949
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	7,032	7,407
Europe, the Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	96,379	96,417
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	56,115	55,726
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	10,900	10,710
Netherlands
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	10,604	11,975
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	1,724	1,507
Switzerland
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	14,129	13,445
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	2,907	3,054
Asia Pacific Region
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	33,795	33,011
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	4,892	5,111
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	21,922	20,243
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 6,981	$ 7,657

FAIR VALUE MEASUREMENTS (Narrat

FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment of contingent consideration		$ 3,135	$ 6,431	$ 1,500
ezyVet
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payment					$ 7,000
Another acquisition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment of contingent consideration	$ 100
Estimated fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value disclosure		670,000	725,600
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value disclosure		$ 698,200	$ 769,800

FAIR VALUE MEASUREMENTS (Schedu

FAIR VALUE MEASUREMENTS (Schedule of Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Money market funds | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, term of contract	90 days
Fair Value, Recurring | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 290,807
Fair Value, Recurring | Equity mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity mutual fund	99	$ 385
Fair Value, Recurring | Cross currency swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	664	9,262
Derivative liabilities	5,041
Fair Value, Recurring | Foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,783	5,185
Derivative liabilities	5,532	4,572
Fair Value, Recurring | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,451
Fair Value, Recurring | Deferred compensation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	99	385
Fair Value, Recurring | Contingent payment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payments - acquisitions		120
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	290,807
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity mutual fund	99	385
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cross currency swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liabilities	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liabilities	0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Deferred compensation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	99	385
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Contingent payment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payments - acquisitions		0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Equity mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity mutual fund	0	0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Cross currency swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	664	9,262
Derivative liabilities	5,041
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,783	5,185
Derivative liabilities	5,532	4,572
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,451
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Deferred compensation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	0	0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Contingent payment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payments - acquisitions		0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Equity mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity mutual fund	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Cross currency swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liabilities	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liabilities	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Deferred compensation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	$ 0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Contingent payment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payments - acquisitions		$ 120

FAIR VALUE MEASUREMENTS (Sche_2

FAIR VALUE MEASUREMENTS (Schedule of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 120	$ 7,230
Payment of contingent consideration	(99)	(7,110)
Change in estimated fair value	$ (21)	$ 0
Fair value recurring basis unobservable input reconciliation liability gain loss statement of income extensible list not disclosed flag	consolidated statements of income	consolidated statements of income
Ending balance	$ 0	$ 120

HEDGING INSTRUMENTS (Narrative)

HEDGING INSTRUMENTS (Narrative) (Details)				3 Months Ended	12 Months Ended
	Jun. 30, 2028 USD ($)	Mar. 31, 2028 USD ($)	Jun. 18, 2025 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 EUR (€)	Jun. 30, 2023 EUR (€)	Mar. 31, 2023 USD ($)	Jun. 30, 2015 EUR (€)
Derivative [Line Items]
Credit facility					$ 250,000,000	$ 579,000,000
General duration of foreign currency exchange contracts					24 months
Unrealized gain (loss) on Euro-denominated notes, net of tax					$ (2,601,000)	4,525,000	$ 6,404,000
Proceeds from net investment hedges					8,377,000	0	0
Unrealized gain (loss) on cross currency swaps, net of tax					(5,629,000)	3,817,000	$ 5,399,000
Excluded component recognized as reduction of interest					2,100,000	2,800,000
Series C Senior Note
Derivative [Line Items]
Debt instrument, face amount | €											€ 88,900,000
Stated interest rate (percent)											1.785%
Interest rate swap
Derivative [Line Items]
Estimated net amount of gains (losses) expected to be reclassified out of accumulated other comprehensive income and into earnings within next 12 months					1,700,000
Derivative, fixed interest rate (percent)										3.90%
Foreign currency exchange contracts
Derivative [Line Items]
Estimated net amount of gains (losses) expected to be reclassified out of accumulated other comprehensive income and into earnings within next 12 months					(2,400,000)
Derivative, notional amount					$ 294,000,000	$ 258,200,000
Foreign currency exchange contracts | Minimum
Derivative [Line Items]
Cash flow hedge, hedge percentage of estimated exposure from intercompany products purchases and sales (percent)					75%
Foreign currency exchange contracts | Maximum
Derivative [Line Items]
Cash flow hedge, hedge percentage of estimated exposure from intercompany products purchases and sales (percent)					85%
Cross currency swaps | Derivatives and non-derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, notional amount | €									€ 90,000,000
Proceeds from net investment hedges				$ 6,300,000
Cross currency swap | Derivatives and non-derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, notional amount | €								€ 15,000,000
Cross currency swap | Derivatives and non-derivatives designated as hedging instruments | Forecast
Derivative [Line Items]
Proceeds from net investment hedges			$ 17,500,000
Cross currency swap | Derivatives and non-derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, notional amount | €								35,000,000
Cross currency swap | Derivatives and non-derivatives designated as hedging instruments | Forecast
Derivative [Line Items]
Proceeds from net investment hedges		$ 37,800,000
Cross currency swap | Derivatives and non-derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, notional amount | €								€ 90,000,000
Cross currency swap | Derivatives and non-derivatives designated as hedging instruments | Forecast
Derivative [Line Items]
Proceeds from net investment hedges	$ 98,200,000
Secured Debt | Interest rate swap
Derivative [Line Items]
Credit facility										$ 250,000,000

HEDGING INSTRUMENTS (Derivative

HEDGING INSTRUMENTS (Derivatives Designated in Cash Flow Hedging Relationships) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Foreign Currency Fair Value Hedge Derivative [Line Items]
Cost of revenue	$ 1,470,983	$ 1,362,986	$ 1,325,928
Interest expense	(41,581)	(39,858)	(29,808)
Designated designated as a hedging instrument
Foreign Currency Fair Value Hedge Derivative [Line Items]
Cost of revenue	1,470,983	1,362,986	1,325,928
Interest expense	(41,581)	(39,858)	(29,808)
Foreign exchange contracts | Designated designated as a hedging instrument
Foreign Currency Fair Value Hedge Derivative [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into net income	3,512	25,733	(7,121)
Interest rate swap contract | Designated designated as a hedging instrument
Foreign Currency Fair Value Hedge Derivative [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into net income	$ 2,656	$ 0	$ 0

HEDGING INSTRUMENTS (Schedule o

HEDGING INSTRUMENTS (Schedule of Fair Values and Balance Sheet Classifications of Derivatives Designated as Hedging Instruments) (Details) - Derivatives and non-derivatives designated as hedging instruments - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Total derivative instruments presented as hedge instruments on the balance sheet	$ 3,898	$ 14,447
Gross amounts subject to master netting arrangements not offset on the balance sheet	(1,783)	(3,210)
Net amount	2,115	11,237
Total hedging instruments presented on the balance sheet	108,760	99,347
Gross amounts subject to master netting arrangements not offset on the balance sheet	(1,783)	(3,210)
Net amount	106,977	96,137
Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Total hedging instruments presented on the balance sheet	10,573	4,572
Other current assets | Foreign currency exchange contracts | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Total derivative instruments presented as hedge instruments on the balance sheet	1,783	5,185
Other current assets | Cross currency swaps | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Total derivative instruments presented as hedge instruments on the balance sheet	0	8,135
Other long-term assets | Cross currency swaps | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Total derivative instruments presented as hedge instruments on the balance sheet	664	1,127
Other long-term assets | Interest rate swap contract | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Total derivative instruments presented as hedge instruments on the balance sheet	1,451	0
Accrued liabilities | Foreign currency exchange contracts | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Total hedging instruments presented on the balance sheet	5,532	4,572
Other long-term liabilities | Cross currency swaps | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Total hedging instruments presented on the balance sheet	5,041	0
Long-term debt | Non-derivative foreign currency denominated debt designated as net investment hedge on the balance sheet
Derivatives, Fair Value [Line Items]
Total hedging instruments presented on the balance sheet	$ 98,187	$ 94,775

REPURCHASES OF COMMON STOCK (De

REPURCHASES OF COMMON STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity [Abstract]
Shares of common stock repurchases authorized (in shares)	73,000,000
Remaining shares available for repurchase under authorization (in shares)	2,900,000
Shares repurchased in the open market (in shares)	155,000	1,963,000	1,283,000
Shares acquired through employee surrenders for statutory tax withholding (in shares)	20,000	21,000	29,000
Total shares repurchased (in shares)	175,000	1,984,000	1,312,000
Cost of shares repurchased in the open market	$ 72,639	$ 810,942	$ 755,545
Cost of shares for employee surrenders	9,974	10,606	15,562
Total cost of shares	$ 82,613	$ 821,548	$ 771,107
Average cost per share - open market repurchases (in USD per share)	$ 468.84	$ 413.12	$ 588.58
Average cost per share - employee surrenders (in USD per share)	503.28	501.89	548.08
Average cost per share - total (in USD per share)	$ 472.74	$ 414.06	$ 587.70

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (Schedule of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	$ 608,737	$ 689,992
Balance end of period	1,484,530	608,737
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(77,796)	(53,484)
Other comprehensive income (loss) before reclassifications	10,540	(5,827)
Amounts reclassified from accumulated other comprehensive income	(3,950)	(18,485)
Balance end of period	(71,206)	(77,796)
Unrealized (Loss) Gain on Investments, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(172)	(126)
Other comprehensive income (loss) before reclassifications	8	(46)
Amounts reclassified from accumulated other comprehensive income	0	0
Balance end of period	(164)	(172)
Unrealized Gain (Loss) on Cash Flow Hedges, Net of Tax | Foreign Currency Exchange Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	839	4,979
Other comprehensive income (loss) before reclassifications	(792)	14,851
Amounts reclassified from accumulated other comprehensive income	(2,444)	(18,991)
Balance end of period	(2,397)	839
Unrealized Gain (Loss) on Cash Flow Hedges, Net of Tax | Interest Rate Swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	0	0
Other comprehensive income (loss) before reclassifications	3,131	0
Amounts reclassified from accumulated other comprehensive income	(2,025)	0
Balance end of period	1,106	0
Unrealized Gain (Loss) on Net Investment Hedges, Net of Tax | Euro-Denominated Notes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	4,947	422
Other comprehensive income (loss) before reclassifications	(2,601)	4,525
Amounts reclassified from accumulated other comprehensive income	0	0
Balance end of period	2,346	4,947
Unrealized Gain (Loss) on Net Investment Hedges, Net of Tax | Cross Currency Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	7,057	3,240
Other comprehensive income (loss) before reclassifications	(5,629)	3,817
Amounts reclassified from accumulated other comprehensive income	0	0
Balance end of period	1,428	7,057
Defined Benefit Plans, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(2,776)	0
Other comprehensive income (loss) before reclassifications	(1,302)	(3,282)
Amounts reclassified from accumulated other comprehensive income	519	506
Balance end of period	(3,559)	(2,776)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(87,691)	(61,999)
Other comprehensive income (loss) before reclassifications	17,725	(25,692)
Amounts reclassified from accumulated other comprehensive income	0	0
Balance end of period	$ (69,966)	$ (87,691)

ACCUMULATED OTHER COMPREHENSI_4

ACCUMULATED OTHER COMPREHENSIVE INCOME (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of revenue	$ 1,470,983	$ 1,362,986	$ 1,325,928
Interest expense	41,581	39,858	29,808
Tax (expense) benefit	216,134	180,883	157,810
Gains (losses), net of tax	845,042	679,089	744,844
Reclassification out of accumulated other comprehensive income | Cash flow hedge | Foreign currency exchange contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of revenue	3,512	25,733	(7,121)
Tax (expense) benefit	(1,068)	(6,742)	1,347
Gains (losses), net of tax	2,444	18,991	(5,774)
Reclassification out of accumulated other comprehensive income | Cash flow hedge | Interest rate swap contract
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	2,656	0	0
Tax (expense) benefit	(631)	0	0
Gains (losses), net of tax	2,025	0	0
Reclassification out of accumulated other comprehensive income | Defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of revenue	(630)	(605)	0
Tax (expense) benefit	111	99	0
Gains (losses), net of tax	$ (519)	$ (506)	$ 0

PREFERRED STOCK (Details)

PREFERRED STOCK (Details) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Shares of preferred stock authorized (in shares)	500,000
Par value per share (in USD per share)	$ 1
Preferred stock outstanding (in shares)	0	0

IDEXX RETIREMENT AND INCENTIV_3

IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan | Switzerland
Retirement And Incentive Savings Plan [Line Items]
Defined benefit plan, benefit obligation	$ 5,600,000
Defined benefit plan, plan assets, amount	14,400,000
Pension expense	$ 1,100,000
401(k) Plan
Retirement And Incentive Savings Plan [Line Items]
Contribution match, maximum percent of participants' eligible compensation (percent)	5%	5%	5%
Employer contributions	$ 30,300,000	$ 28,300,000	$ 25,800,000
Discretionary contributions	$ 0	$ 0	$ 0

IDEXX RETIREMENT AND INCENTIV_4

IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN (Schedule of Future Benefits Expected to be Paid) (Details) - Pension Plan - Switzerland $ in Thousands	Dec. 31, 2023 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2024	$ 829
2025	1,154
2026	1,035
2027	1,087
2028	1,090
2029 through 2033	$ 6,405