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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, 2019 | Dec. 31, 2018
Assets: |  |  |
Restricted Investments |  | $ 70,974 | $ 58,142
Municipal Bonds [Member] |  |  |
Assets: |  |  |
Investments in lieu of retainage |  | 1,200 | 1,200
Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | [1] | 193,685 | 116,075
Restricted cash | [1] | 8,416 | 3,788
Restricted investments | [2] | 70,974 | 58,142
Investments in lieu of retainage | [3] | 90,791 | 64,048
Total |  | 363,866 | 242,053
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets (Level 1) [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | [1] | 193,685 | 116,075
Restricted cash | [1] | 8,416 | 3,788
Investments in lieu of retainage | [3] | 89,572 | 62,858
Total |  | 291,673 | 182,721
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Restricted investments | [2] | 70,974 | 58,142
Investments in lieu of retainage | [3] | 1,219 | 1,190
Total |  | 72,193 | $ 59,332
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | [1] |  |
Restricted cash | [1] |  |
Restricted investments | [2] |  |
Investments in lieu of retainage | [3] |  |
Total |  |  |
Maximum [Member] |  |  |
Assets: |  |  |
Restricted investment maturity period |  | 5 years | 5 years
Corporate Debt Securities [Member] |  |  |
Assets: |  |  |
Restricted and other investments |  | $ 35,800 | $ 30,400
US Government Agencies Securities [Member] |  |  |
Assets: |  |  |
Restricted and other investments |  | 33,800 | 27,700
Certificates of Deposit [Member] |  |  |
Assets: |  |  |
Restricted and other investments |  | 1,400 |
Money Market Funds [Member] |  |  |
Assets: |  |  |
Investments in lieu of retainage |  | $ 89,600 | $ 62,900
[1] | Includes money market funds and short-term investments with maturity dates of three months or less when acquired.
[2] | Restricted investments, as of December 31, 2019, consist of investments in corporate debt securities of $35.8 million, U.S. government agency securities of $33.8 million and corporate certificates of deposits of $1.4 million with maturities of up to five years, and are valued based on pricing models, which are determined from a compilation of primarily observable market information, broker quotes in non-active markets or similar assets and are therefore classified as Level 2 assets. As of December 31, 2018, restricted investments consisted of investments in corporate debt securities of $30.4 million and U.S. government agency securities of $27.7 million with maturities of up to five years. The amortized cost of these available-for-sale securities at December 31, 2019 and 2018 was not materially different from the fair value.
[3] | Investments in lieu of retainage are included in retainage receivable and as of December 31, 2019 are comprised of money market funds of $89.6 million and municipal bonds of $1.2 million. The fair values of the money market funds are measured using quoted market prices; therefore, they are classified as Level 1 assets. The fair values of municipal bonds are measured using readily available pricing sources for comparable instruments; therefore, they are classified as Level 2 assets. As of December 31, 2018, investments in lieu of retainage consisted of money market funds of $62.9 million and municipal bonds of $1.2 million. The amortized cost of these available-for-sale securities at December 31, 2019 and 2018 was not materially different from the fair value. The Company did not have material transfers between Levels 1 and 2 during the years ended December 31, 2019 and 2018.

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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 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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