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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Assets and liabilities measured on recurring basis | The following tables set forth information regarding the Company’s financial assets and financial liabilities that are measured at fair value on a recurring basis:
Description | December 31, 2021 |  | Assets measured at NAV (g) |  | Level 1 |  | Level 2 |  | Level 3
Hedge derivatives, net: |  |  |  |  |  |  |  |  |
Commodity contracts | $ | 1,491 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,491 |  |  | $ | — |
Foreign exchange contracts | (121) |  |  | — |  |  | — |  |  | (121) |  |  | — |
Non-hedge derivatives, net: |  |  |  |  |  |  |  |  |
Commodity contracts | 683 |  |  |  |  |  |  | 683 |  |  |
Foreign exchange contracts | (41) |  |  | — |  |  | — |  |  | (41) |  |  | — |
Interest rate lock contract | (550) |  |  |  |  | — |  |  | (550) |  |  | — |
Postretirement benefit plan assets: |  |  |  |  |  |  |  |  |
Common Collective(a) | $ | 8,882 |  |  | $ | 8,882 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Mutual funds(b) | 118,559 |  |  | — |  |  | — |  |  | 118,559 |  |  | — |
Fixed income securities(c) | 292,883 |  |  | 41,120 |  |  | — |  |  | 251,763 |  |  | — |
Short-term investments(d) | 1,211 |  |  | — |  |  | — |  |  | 1,211 |  |  | — |
Real estate funds(f) | 592 |  |  | 592 |  |  | — |  |  | — |  |  | — |
Cash and accrued income | 8,920 |  |  | — |  |  | 8,920 |  |  | — |  |  | — |
Total postretirement benefit plan assets | $ | 431,047 |  |  | $ | 50,594 |  |  | $ | 8,920 |  |  | $ | 371,533 |  |  | $ | — |
Description | December 31, 2020 |  | Assets measured at NAV (g) |  | Level 1 |  | Level 2 |  | Level 3
Hedge derivatives, net: |  |  |  |  |  |  |  |  |
Commodity contracts | $ | (647) |  |  | $ | — |  |  | $ | — |  |  | $ | (647) |  |  | $ | — |
Foreign exchange contracts | 602 |  |  | — |  |  | — |  |  | 602 |  |  | — |
Non-hedge derivatives, net: |  |  |  |  |  |  |  |  |
Commodity contracts | 484 |  |  |  |  |  |  | 484 |  |  |
Foreign exchange contracts | 115 |  |  | — |  |  | — |  |  | 115 |  |  | — |
Postretirement benefit plan assets: |  |  |  |  |  |  |  |  |
Common Collective(a) | $ | 7,750 |  |  | $ | 7,750 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Mutual funds(b) | 152,756 |  |  | — |  |  | — |  |  | 152,756 |  |  | — |
Fixed income securities(c) | 1,533,149 |  |  | 1,297,826 |  |  | 17 |  |  | 235,306 |  |  | — |
Short-term investments(d) | 1,223 |  |  | — |  |  | — |  |  | 1,223 |  |  | — |
Hedge fund of funds(e) | 67 |  |  | 67 |  |  | — |  |  | — |  |  | — |
Real estate funds(f) | 552 |  |  | 552 |  |  | — |  |  | — |  |  | — |
Cash and accrued income | 117,638 |  |  | — |  |  | 117,638 |  |  | — |  |  | — |
Total postretirement benefit plan assets | $ | 1,813,135 |  |  | $ | 1,306,195 |  |  | $ | 117,655 |  |  | $ | 389,285 |  |  | $ | — |
a.Common collective trust investments consist of domestic and international large and mid capitalization equities, including emerging markets and funds invested in both short-term and long-term bonds. Underlying investments are generally valued at closing prices from national exchanges. Commingled funds, private securities, and limited partnerships are valued at unit values or net asset values provided by the investment managers. b.Mutual fund investments are comprised of equity securities of corporations with large capitalizations and also include funds invested in corporate equities in international and emerging markets and funds invested in long-term bonds, which are valued at closing prices from national exchanges. c.Fixed income securities include funds that invest primarily in government securities and long-term bonds. Underlying investments are generally valued at closing prices from national exchanges, fixed income pricing models, and independent financial analysts. Fixed income commingled funds are valued at unit values provided by the investment managers. d.Short-term investments include several money market funds used for managing overall liquidity. Underlying investments are generally valued at closing prices from national exchanges. Commingled funds are valued at unit values provided by the investment managers. e.The hedge fund of funds category includes investments in funds representing a variety of strategies intended to diversify risks and reduce volatility. It includes event-driven credit and equity investments targeted at economic policy decisions, long and short positions in U.S. and international equities, arbitrage investments and emerging market equity investments. Investments are valued at unit values or net asset values provided by the investment managers. f.This category includes investments in real estate funds (including office, industrial, residential and retail). Underlying real estate securities are generally valued at closing prices from national exchanges. g.Certain assets that are measured at fair value using the net asset value (NAV) per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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