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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Municipal Bonds [Member] |  |
Assets: |  |
Investments in lieu of retainage | $ 1,200 | $ 1,200
Money Market Funds [Member] |  |
Assets: |  |
Investments in lieu of retainage | 71,800 | 62,900
US Government Agencies Debt Securities [Member] |  |
Assets: |  |
Restricted and other investments | 28,300 | 27,700
Corporate Debt Securities [Member] |  |
Assets: |  |
Restricted and other investments | 37,000 | 30,400
Fair Value Measured On A Recurring Basis [Member] |  |
Assets: |  |
Cash and cash equivalents | 149,881 | 116,075
Restricted cash | 4,742 | 3,788
Restricted investments | 65,287 | 58,142
Investments in lieu of retainage | 73,014 | 64,048
Total assets | 292,924 | 242,053
Fair Value Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets (Level 1) [Member] |  |
Assets: |  |
Cash and cash equivalents | 149,881 | 116,075
Restricted cash | 4,742 | 3,788
Investments in lieu of retainage | 71,828 | 62,858
Total assets | 226,451 | 182,721
Fair Value Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Restricted investments | 65,287 | 58,142
Investments in lieu of retainage | 1,186 | 1,190
Total assets | $ 66,473 | $ 59,332
Maximum [Member] |  |
Assets: |  |
Restricted And other investments, term | 5 years |

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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=99377789&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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