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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Measurements [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | ﻿
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﻿ |  | As of June 30, 2017 |  | As of December 31, 2016
﻿ |  | Fair Value Hierarchy |  | Fair Value Hierarchy
﻿(in thousands) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
﻿Cash and cash equivalents (a) |  | $ | 172,927 |  | $ | 172,927 |  | $ | — |  | $ | — |  | $ | 146,103 |  | $ | 146,103 |  | $ | — |  | $ | —
﻿Restricted cash (a) |  |  | 52,051 |  |  | 52,051 |  |  | — |  |  | — |  |  | 50,504 |  |  | 50,504 |  |  | — |  |  | —
﻿Investments in lieu of retainage (b) |  |  | 56,024 |  |  | 52,992 |  |  | 3,032 |  |  | — |  |  | 51,266 |  |  | 46,855 |  |  | 4,411 |  |  | —
﻿Restricted investments (c) |  |  | 9,281 |  |  | — |  |  | 9,281 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
﻿Total |  | $ | 290,283 |  | $ | 277,970 |  | $ | 12,313 |  | $ | — |  | $ | 247,873 |  | $ | 243,462 |  | $ | 4,411 |  | $ | —
____________________________________________________________________________________________________ (a)Includes money market funds with original maturity dates of three months or less. (b)Investments in lieu of c ustomer retainage are included in accounts receivable and are comprised of money market funds and municipal bonds, th e majority of which are rated A 3 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. (c)Restricted investments are held as collateral to secure our insurance related contingent obligations. The balances of these investments are held to maturity and are carried at their amortized cost of $9.3 million, which are included in other current assets. These restricted investments are comprised of various corporate bonds and bank notes which are rated A2 or better. The fair values of the corporate bonds and bank notes are measured using readily available sources for comparable instruments; therefore, they are classified as Level 2 assets.

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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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