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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Measurements [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | ﻿
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﻿ |  | As of March 31, 2018 |  | As of December 31, 2017
﻿ |  | Fair Value Hierarchy |  |  |  |  | Fair Value Hierarchy |  |  |
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Cash and cash equivalents(a) |  | $ | 174,340 |  | $ | — |  | $ | — |  | $ | 174,340 |  | $ | 192,868 |  | $ | — |  | $ | — |  | $ | 192,868
﻿Restricted cash(a) |  |  | 4,090 |  |  | — |  |  | — |  |  | 4,090 |  |  | 4,780 |  |  | — |  |  | — |  |  | 4,780
﻿Investments in lieu of retainage(b) |  |  | 65,708 |  |  | 2,101 |  |  | — |  |  | 67,809 |  |  | 69,891 |  |  | 2,405 |  |  | — |  |  | 72,296
﻿Total |  | $ | 244,138 |  | $ | 2,101 |  | $ | — |  | $ | 246,239 |  | $ | 267,539 |  | $ | 2,405 |  | $ | — |  | $ | 269,944
| (a) |  | Includes money market funds with original maturity dates of three months or less.
| (b) |  | Investments in lieu of retainage are included in retainage receivable and are comprised of money market funds and municipal bonds, the majority of which are rated A3 or better. 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. All of the above investments are available-for-sale securities.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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