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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Debt Securities, Available-for-sale | Details of available-for-sale securities were as follows:
December 31, 2021 | Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
| (In thousands)
Mortgage-backed securities | $ | 8,702 |  | $ | 51 |  | $ | 47 |  | $ | 8,706 |
U.S. Treasury securities | 2,407 |  | — |  | 11 |  | 2,396 |
Total | $ | 11,109 |  | $ | 51 |  | $ | 58 |  | $ | 11,102 |
December 31, 2020 | Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
| (In thousands)
Mortgage-backed securities | $ | 9,799 |  | $ | 156 |  | $ | 9 |  | $ | 9,946 |
U.S. Treasury securities | 1,386 |  | — |  | 5 |  | 1,381 |
Total | $ | 11,185 |  | $ | 156 |  | $ | 14 |  | $ | 11,327 |
Assets and liabilities measured at fair value on a recurring basis | The Company's assets measured at fair value on a recurring basis were as follows:
| Fair Value Measurements at December 31, 2021, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2021
| (In thousands)
Assets: |  |  |  |
Money market funds | $ | — |  | $ | 10,190 |  | $ | — |  | $ | 10,190 |
Insurance contract* | — |  | 109,603 |  | — |  | 109,603 |
Available-for-sale securities: |  |  |  |
Mortgage-backed securities | — |  | 8,706 |  | — |  | 8,706 |
U.S. Treasury securities | — |  | 2,396 |  | — |  | 2,396 |
Total assets measured at fair value | $ | — |  | $ | 130,895 |  | $ | — |  | $ | 130,895 |
*The insurance contract invests approximately 61 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 5 percent in target date investments and 2 percent in cash equivalents.
| Fair Value Measurements at December 31, 2020, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2020
| (In thousands)
Assets: |  |  |  |
Money market funds | $ | — |  | $ | 8,917 |  | $ | — |  | $ | 8,917 |
Insurance contract* | — |  | 100,104 |  | — |  | 100,104 |
Available-for-sale securities: |  |  |  |
Mortgage-backed securities | — |  | 9,946 |  | — |  | 9,946 |
U.S. Treasury securities | — |  | 1,381 |  | — |  | 1,381 |
Total assets measured at fair value | $ | — |  | $ | 120,348 |  | $ | — |  | $ | 120,348 |
*The insurance contract invests approximately 57 percent in fixed-income investments, 18 percent in common stock of large-cap companies, 9 percent in common stock of mid-cap companies, 9 percent in common stock of small-cap companies, 5 percent in target date investments and 2 percent in cash equivalents.
Fair value of long-term debt outstanding | The estimated fair value of the Company's Level 2 long-term debt at December 31 was as follows:
| 2021 | 2020
| (In thousands)
Carrying Amount | $ | 2,741,900 |  | $ | 2,213,130 |
Fair Value | $ | 2,984,866 |  | $ | 2,537,289 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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- 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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