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Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Assets: |  |
Cash and cash equivalents maturity period (maximum) | 3 months |
Fair value measured on a recurring basis |  |
Assets: |  |
Cash and cash equivalents | $ 695,732 | $ 455,084
Restricted cash | 62,352 | 9,104
Restricted investments | 173,435 | 139,986
Investments in lieu of retention | 175,485 | 145,124
Total | 1,107,004 | 749,298
Fair value measured on a recurring basis | Level 1 |  |
Assets: |  |
Cash and cash equivalents | 695,732 | 455,084
Restricted cash | 62,352 | 9,104
Restricted investments | 0 | 0
Investments in lieu of retention | 35,153 | 38,359
Total | 793,237 | 502,547
Fair value measured on a recurring basis | Level 1 | Money Market Funds |  |
Assets: |  |
Investments in lieu of retention | 35,200 | 38,400
Fair value measured on a recurring basis | Level 2 |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Restricted investments | 173,435 | 139,986
Investments in lieu of retention | 140,332 | 106,765
Total | 313,767 | 246,751
Fair value measured on a recurring basis | Level 2 | Debt Securities |  |
Assets: |  |
Investments in lieu of retention | 140,300 | 106,800
Fair value measured on a recurring basis | Level 3 |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Restricted investments | 0 | 0
Investments in lieu of retention | 0 | 0
Total | $ 0 | $ 0

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes investments in lieu of retainage which are classified as Account Receivables and are comprised of U.S. Treasury Notes and other municipal bonds. + References No definition available. + Details
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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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