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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements The fair value hierarchy prioritizes the use of inputs used in valuation techniques into the following three levels: •Level 1 — quoted prices in active markets for identical assets and liabilities •Level 2 — inputs other than quoted prices in active markets for identical assets and liabilities that are observable, either directly or indirectly •Level 3 — unobservable inputs We perform procedures to verify the reasonableness of pricing information received from third parties for significant assets and liabilities classified as Level 2. The following table delineates assets and liabilities that are measured at fair value on a recurring basis:
| December 31, 2020 |  | December 31, 2019
(in thousands) | Total | Level 1 | Level 2 | Level 3 |  | Total | Level 1 | Level 2 | Level 3
Assets: |  |  |  |  |  |  |  |  |
Deferred compensation trusts(1) | $ | 9,626 |  | $ | 9,626 |  | $ | — |  | $ | — |  |  | $ | 7,719 |  | $ | 7,719 |  | $ | — |  | $ | — |
Derivative assets(2) |  |  |  |  |  |  |  |  |
Foreign currency | 22,667 |  | — |  | 22,667 |  | — |  |  | 7,167 |  | — |  | 7,167 |  | — |
Commodity | 806 |  | — |  | 806 |  | — |  |  | 46 |  | — |  | 46 |  | — |
Liabilities: |  |  |  |  |  |  |  |  |
Derivative liabilities(2) |  |  |  |  |  |  |  |  |
Foreign currency | $ | 2,571 |  | $ | — |  | $ | 2,571 |  | $ | — |  |  | $ | 6,561 |  | $ | — |  | $ | 6,561 |  | $ | — |
Commodity | 5,059 |  | — |  | 5,059 |  | — |  |  | 1,247 |  | — |  | 1,247 |  | — |
(1)Consists of registered money market funds and an equity index fund. These investments, which are trading securities, represent the net asset value as of the close of business at the end of the period based on the last trade or official close of an active market or exchange. (2)Foreign currency and commodity derivatives are estimated using pricing models with market-based inputs, which take into account the present value of estimated future cash flows. During 2018, proceeds from sales and maturities of available-for-sale securities were $175 million. There were no sales or maturities of available-for-sale securities during 2020 and 2019. We have measured assets and liabilities held for sale and certain other impaired assets at fair value on a nonrecurring basis. The following summarizes information about our financial instruments that are not required to be measured at fair value:
|  | December 31, 2020 |  | December 31, 2019
(in thousands) | Fair Value Hierarchy | Carrying Value | Fair Value |  | Carrying Value | Fair Value
Assets: |  |  |  |  |  |
Cash(1) | Level 1 | $ | 1,180,024 |  | $ | 1,180,024 |  |  | $ | 1,014,138 |  | $ | 1,014,138 |
Cash equivalents(2) | Level 2 | 1,018,757 |  | 1,018,757 |  |  | 983,061 |  | 983,061 |
Marketable securities, current(2) | Level 2 | 23,345 |  | 23,345 |  |  | 7,262 |  | 7,262 |
Notes receivable, including noncurrent portion(3) | Level 3 | 38,295 |  | 38,295 |  |  | 28,117 |  | 28,117 |
Liabilities: |  |  |  |  |  |
2023 Senior Notes(4) | Level 2 | $ | 609,764 |  | $ | 578,554 |  |  | $ | 557,185 |  | $ | 562,399 |
2024 Senior Notes(4) | Level 2 | 496,200 |  | 494,045 |  |  | 495,240 |  | 510,145 |
2028 Senior Notes(4) | Level 2 | 595,134 |  | 599,220 |  |  | 594,502 |  | 609,918 |
Other borrowings, including noncurrent portion(5) | Level 2 | 34,350 |  | 34,350 |  |  | 43,539 |  | 43,539 |
_______________________________________________________________________________ (1)Cash consists of bank deposits. Carrying amounts approximate fair value. (2)The carrying amounts of these time deposits approximate fair value because of the short-term maturity of these instruments. Amortized cost is not materially different from the fair value. (3)Notes receivable are carried at net realizable value which approximates fair value. Factors considered in determining the fair value include the credit worthiness of the borrower, current interest rates, the term of the note and any collateral pledged as security. Notes receivable are periodically assessed for impairment. (4)The fair value of the Senior Notes was estimated based on quoted market prices and Level 2 inputs. (5)Other borrowings primarily represent bank loans and other financing arrangements which primarily mature within one year. The carrying amount of borrowings under these arrangements approximates fair value because of the short-term maturity.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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