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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2016
Fair Value Measurements [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | ﻿
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﻿ |  | September 30, 2016 |  | December 31, 2015
﻿ |  | Fair Value Hierarchy |  | Fair Value Hierarchy
﻿(in thousands) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
﻿Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash and cash equivalents (a) |  | $ | 170,744 |  | $ | 170,744 |  | $ | — |  | $ | — |  | $ | 75,452 |  | $ | 75,452 |  | $ | — |  | $ | —
﻿Restricted cash (a) |  |  | 48,725 |  |  | 48,725 |  |  | — |  |  | — |  |  | 45,853 |  |  | 45,853 |  |  | — |  |  | —
﻿Investments in lieu of retainage (b) |  |  | 48,425 |  |  | 43,820 |  |  | 4,605 |  |  | — |  |  | 41,566 |  |  | 35,350 |  |  | 6,216 |  |  | —
﻿Total |  | $ | 267,894 |  | $ | 263,289 |  | $ | 4,605 |  | $ | — |  | $ | 162,871 |  | $ | 156,655 |  | $ | 6,216 |  | $ | —
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﻿Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Interest rate swap contract (c) |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 45 |  | $ | — |  | $ | 45 |  | $ | —
﻿Total |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 45 |  | $ | — |  | $ | 45 |  | $ | —
| (a) |  | Cash, cash equivalents and restricted cash consist primarily of money market funds with original maturity dates of three months or less, for which fair value is determined through quoted market prices.
| (b) |  | Investments in lieu of retainage are classified as account s r eceivable and are comprised primarily of mo ney market funds, U.S. Treasury Notes and other municipal bonds, the majority of which are rated Aa3 or better. The fair values of the U.S. Treasury Notes and municipal bonds are obtained from readily-available pricing sources for comparable instruments and, as such, the Company has classified these assets as Level 2.
| (c) |  | The Company values the interest rate swap liability utilizing a discounted cash flow model that takes into consideration forward interest rates observable in the market and the counterparty’s risk. The Company's only interes t rate swap contract expired in June 2016.

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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=36462937&loc=d3e19190-110258 + Details
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