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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Assets: |  |
Restricted cash | $ 3,436 | $ 4,780
Restricted and other investments, amortized cost | 60,100 |
Amortized cost of investments held to maturity |  | 59,600
Fair value of investments held to maturity |  | 59,100
Municipal Bonds [Member] |  |
Assets: |  |
Investments in lieu of retainage | 1,200 | 2,400
Money Market Funds [Member] |  |
Assets: |  |
Investments in lieu of retainage | 62,300 | 69,900
US Government Agencies Debt Securities [Member] |  |
Assets: |  |
Restricted and other investments | 26,300 | 26,100
Corporate Debt Securities [Member] |  |
Assets: |  |
Restricted and other investments | 31,400 | 33,000
Fair Value Measured On A Recurring Basis [Member] |  |
Assets: |  |
Cash and cash equivalents | 118,258 | 192,868
Restricted cash | 3,436 | 4,780
Restricted investments | 53,116 |
Investments in lieu of retainage | 63,530 | 72,296
Other investments | 4,611 |
Total assets | 242,951 | 269,944
Fair Value Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets (Level 1) [Member] |  |
Assets: |  |
Cash and cash equivalents | 118,258 | 192,868
Restricted cash | 3,436 | 4,780
Investments in lieu of retainage | 62,341 | 69,891
Total assets | 184,035 | 267,539
Fair Value Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Restricted investments | 53,116 |
Investments in lieu of retainage | 1,189 | 2,405
Other investments | 4,611 |
Total assets | $ 58,916 | $ 2,405
Minimum [Member[ |  |
Assets: |  |
Restricted And other investments, term | 1 month |
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 Amount 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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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