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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Municipal Bonds |  |
Assets: |  |
Investments in lieu of retainage | $ 1,300 | $ 1,300
Fair Value, Measurements, Recurring |  |
Assets: |  |
Cash and cash equivalents | 202,197 | 374,289
Restricted cash | 9,199 | 77,563
Restricted investments | 84,355 | 78,912
Investments in lieu of retainage | 86,328 | 93,909
Total | 382,079 | 624,673
Fair Value, Measurements, Recurring | Level 1 |  |
Assets: |  |
Cash and cash equivalents | 202,197 | 374,289
Restricted cash | 9,199 | 77,563
Restricted investments | 0 | 0
Investments in lieu of retainage | 27,472 | 92,609
Total | 238,868 | 544,461
Fair Value, Measurements, Recurring | Level 2 |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Restricted investments | 84,355 | 78,912
Investments in lieu of retainage | 58,856 | 1,300
Total | 143,211 | 80,212
Fair Value, Measurements, Recurring | Level 3 |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Restricted investments | 0 | 0
Investments in lieu of retainage | 0 | 0
Total | $ 0 | $ 0
Maximum |  |
Assets: |  |
Restricted investment maturity period | 5 years | 5 years
Maximum | Corporate and Municipal Bonds |  |
Assets: |  |
Restricted investment maturity period | 5 years |
US Government Agencies Securities |  |
Assets: |  |
Restricted and other investments | $ 37,100 | $ 40,500
Corporate Debt Securities |  |
Assets: |  |
Investments in lieu of retainage | 57,500 |
Restricted and other investments | 46,700 | 37,500
Certificates of Deposit |  |
Assets: |  |
Restricted and other investments | 600 | 900
Money Market Funds |  |
Assets: |  |
Investments in lieu of retainage | $ 27,500 | $ 92,600

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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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: 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 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 No definition available. + Details
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