We measure certain financial assets and liabilities at fair value on a recurring basis. Fair value is a market-based measure considered from the perspective of a market participant rather than an entity-specific measure. An entity is required to classify certain assets and liabilities measured at fair value based on the following fair value hierarchy that prioritizes the inputs used to measure fair value:

Level 2 – Quoted prices for identical assets and liabilities in markets that are not active, quoted prices for similar assets and liabilities in active markets 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, may be derived from internally developed methodologies based on management's best estimate of fair value and that are significant to the fair value of the asset or liability.

Financial assets and liabilities 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 requires judgment and may affect its placement within the fair value hierarchy. The following tables show, by level within the fair value hierarchy, our financial assets and liabilities that are accounted for at fair value on a recurring basis.


	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Investment securities
Money market funds	$	73,228	$	434,791	$	—	$	508,019
Equity securities	—		26,583		—		26,583
Commingled fixed income securities	1,722		19,669		—		21,391
Government and related securities	16,776		16,757		—		33,533
Corporate debt securities	—		71,433		—		71,433
Mortgage-backed / asset-backed securities	—		220,678		—		220,678
Derivatives

Foreign exchange contracts	—		3,776		—		3,776
Total assets	$	91,726	$	793,687	$	—	$	885,413
Liabilities:
Derivatives
Interest rate swaps	$	—	$	(2,163)	$	—	$	(2,163)
Foreign exchange contracts	—		(1,960)		—		(1,960)
Total liabilities	$	—	$	(4,123)	$	—	$	(4,123)


	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Investment securities
Money market funds	$	161,441	$	240,364	$	—	$	401,805
Equity securities	—		21,979		—		21,979
Commingled fixed income securities	1,656		18,404		—		20,060
Government and related securities	64,572		17,478		—		82,050
Corporate debt securities	—		72,149		—		72,149
Mortgage-backed / asset-backed securities	—		66,339		—		66,339
Derivatives

Foreign exchange contracts	—		3,256		—		3,256
Total assets	$	227,669	$	439,969	$	—	$	667,638
Liabilities:
Derivatives
Foreign exchange contracts	$	—	$	(1,402)	$	—	$	(1,402)
Total liabilities	$	—	$	(1,402)	$	—	$	(1,402)

The valuation of investment securities is based on a market approach using inputs that are observable, or can be corroborated by observable data, in an active marketplace. The following information relates to our classification within the fair value hierarchy:

•Money Market Funds: Money market funds typically invest in government securities, certificates of deposit, commercial paper and other highly liquid, low risk securities. Money market funds are principally used for overnight deposits and are classified as Level 1 when unadjusted quoted prices in active markets are available and as Level 2 when they are not actively traded on an exchange.

•Commingled Fixed Income Securities: Commingled fixed income securities are comprised of mutual funds that invest in a variety of fixed income securities, including securities of the U.S. government and its agencies, corporate debt, mortgage-backed securities and asset-backed securities. Fair value is based on the value of the underlying investments owned by each fund, minus its liabilities, divided by the number of shares outstanding, as reported by the fund manager. These mutual funds are classified as Level 1 when unadjusted quoted prices in active markets are available and as Level 2 when they are not actively traded on an exchange.

•Government and Related Securities: Debt securities are classified as Level 1 where active, high volume trades for identical securities exist. Valuation adjustments are not applied to these securities. Debt securities are classified as Level 2 where fair value is determined using quoted market prices for similar securities or benchmarking model derived prices to quoted market prices and trade data for identical or comparable securities.

•Corporate Debt Securities: Corporate debt securities are valued using recently executed comparable transactions, market price quotations or bond spreads for the same maturity as the security. These securities are classified as Level 2.

•Mortgage-Backed Securities / Asset-Backed Securities: These securities are valued based on external pricing indices or on external price/spread data. These securities are classified as Level 2.

•Foreign Exchange Contracts: The valuation of foreign exchange derivatives is based on a market approach using observable market inputs, such as foreign currency spot and forward rates and yield curves. We have not seen a material change in the creditworthiness of those banks acting as derivative counterparties. These securities are classified as Level 2.

•Interest Rate Swaps: The valuation of interest rate swaps is based on an income approach using inputs that are observable or that can be derived from, or corroborated by, observable market data. These securities are classified as Level 2.

Available-for-sale securities are predominantly held at the Bank. Investment securities classified as available-for-sale are recorded at fair value with changes in fair value due to market conditions (i.e., interest rates) recorded in accumulated other comprehensive income (AOCI), and changes in fair value due to credit conditions recorded in earnings. There were no unrealized losses due to credit losses charged to earnings in 2020 or 2019.


	December 31, 2020
	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value

Government and related securities	$	31,882	$	157	$	(78)	$	31,961
Corporate debt securities	71,174		614		(355)		71,433
Commingled fixed income securities	1,706		16		—		1,722
Mortgage-backed / asset-backed securities	220,659		734		(715)		220,678
Total	$	325,421	$	1,521	$	(1,148)	$	325,794


	December 31, 2019
	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value

Government and related securities	$	80,732	$	1,358	$	(114)	$	81,976
Corporate debt securities	70,426		2,009		(286)		72,149
Commingled fixed income securities	1,675		—		(19)		1,656
Mortgage-backed / asset-backed securities	65,679		960		(300)		66,339
Total	$	218,512	$	4,327	$	(719)	$	222,120


	December 31, 2020				December 31, 2019
	Fair Value		Gross unrealized losses		Fair Value		Gross unrealized losses
Greater than 12 continuous months	$	2,369	$	76	$	9,227	$	136
Less than 12 continuous months	132,267		1,072		52,521		583
Total	$	134,636	$	1,148	$	61,748	$	719

At December 31, 2020, approximately 20% of total securities in the investment portfolio were in a net loss position. Our allowance for credit losses on available-for-sale investment securities is not significant, but we believe it is adequate as our investments are primarily in highly liquid U.S. government and agency securities, high grade corporate bonds and municipal bonds. We have not recognized an impairment on investment securities in an unrealized loss position because we have the ability and intent to hold these securities until recovery of the unrealized losses or expect to receive the stated principal and interest at maturity.


	Amortized cost		Estimated fair value
Within 1 year	$	17,110	$	17,152
After 1 year through 5 years	7,814		8,000
After 5 years through 10 years	42,553		42,674
After 10 years	257,944		257,968
Total	$	325,421	$	325,794

The actual maturities may not coincide with scheduled maturities as certain securities contain early redemption features and/or allow for the prepayment of obligations with or without penalty.

Held-to-maturity securities at December 31, 2020 and 2019 include $75 million and $383 million, respectively, of short-term, highly liquid time deposits. Due to the short-term nature of these securities, the carrying value approximates fair value.

We enter into foreign exchange contracts to mitigate the currency risk associated with anticipated inventory purchases between affiliates and from third parties. These contracts are designated as cash flow hedges. The effective portion of the gain or loss on cash flow hedges is included in AOCI in the period that the change in fair value occurs and is reclassified to earnings in the period that the hedged item is recorded in earnings. At December 31, 2020 and 2019, outstanding contracts associated with these anticipated transactions had a notional amount of $8 million and $7 million, respectively. The valuation of foreign exchange derivatives is based on a market approach using observable market inputs, such as foreign currency spot and forward rates and yield curves.

We have interest rate swap agreements with an aggregate notional amount of $500 million that are designated as cash flow hedges. The fair value of the interest rate swaps is recorded as a derivative asset or liability at the end of each reporting period with the change in fair value reflected in AOCI.


		December 31,
Designation of Derivatives	Balance Sheet Location	2020		2019
Derivatives designated as hedging instruments
Foreign exchange contracts	Other current assets and prepayments	$	96	$	207
	Accounts payable and accrued liabilities	(112)		(56)

Interest rate swaps	Other noncurrent liabilities	(2,163)		—

Derivatives not designated as hedging instruments
Foreign exchange contracts	Other current assets and prepayments	3,680		3,049

	Accounts payable and accrued liabilities	(1,848)		(1,346)

	Total derivative assets	3,776		3,256
	Total derivative liabilities	(4,123)		(1,402)
	Total net derivative (liability) asset	$	(347)	$	1,854

The amounts included in AOCI at December 31, 2020 will be recognized in earnings within the next 12 months. No amount of ineffectiveness was recorded in earnings for these designated cash flow hedges.









	Years Ended December 31,
	Derivative Gain (Loss) Recognized in AOCI (Effective Portion)				Location of Gain (Loss) (Effective Portion)	Gain (Loss) Reclassified from AOCI to Earnings (Effective Portion)
Derivative Instrument	2020		2019			2020		2019
Foreign exchange contracts	$	(317)	$	371	Revenue	$	(161)	$	72
					Cost of sales	11		104
Interest rate swaps	(2,163)		—		Interest Expense	—		—
	$	(2,480)	$	371		$	(150)	$	176

We also enter into foreign exchange contracts to minimize the impact of exchange rate fluctuations on short-term intercompany loans and related interest that are denominated in a foreign currency. The revaluation of the intercompany loans and interest and the mark-







		Years Ended December 31,
		Derivative Gain (Loss) Recognized in Earnings
Derivatives Instrument	Location of Derivative Gain (Loss)	2020		2019
Foreign exchange contracts	Selling, general and administrative expense	$	5,298	$	5,154

Our financial instruments include cash and cash equivalents, investment securities, accounts receivable, loan receivables, derivative instruments, accounts payable and debt. The carrying value for cash and cash equivalents, accounts receivable, loans receivable, and accounts payable approximate fair value. The fair value of our debt is estimated based on recently executed transactions and market price quotations. The inputs used to determine the fair value of our debt were classified as Level 2 in the fair value hierarchy. The carrying value and estimated fair value of our debt was as follows: