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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Measurements [Abstract] |
Assets and Liabilities Measured at Fair Value on Recurring Basis |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | As of December 31, 2016 |  | As of 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) |  | $ | 146,103 |  | $ | 146,103 |  | $ | — |  | $ | — |  | $ | 75,452 |  | $ | 75,452 |  | $ | — |  | $ | —
﻿Restricted cash (a) |  |  | 50,504 |  |  | 50,504 |  |  | — |  |  | — |  |  | 45,853 |  |  | 45,853 |  |  | — |  |  | —
﻿Investments in lieu of customer retainage (b) |  |  | 51,266 |  |  | 46,855 |  |  | 4,411 |  |  | — |  |  | 41,566 |  |  | 35,350 |  |  | 6,216 |  |  | —
﻿Total |  | $ | 247,873 |  | $ | 243,462 |  | $ | 4,411 |  | $ | — |  | $ | 162,871 |  | $ | 156,655 |  | $ | 6,216 |  | $ | —
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Interest rate swap contract (c) |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 45 |  | $ | — |  | $ | 45 |  | $ | —
﻿Total |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 45 |  | $ | — |  | $ | 45 |  | $ | —
| (a) |  | C ash, cash equivalents and restricted cash consist s primarily of money market funds with original maturit y dates of three months or less measured using quoted market prices.
| (b) |  | Investments in lieu of customer retainage are classified as accounts receivable and are comprised of money market funds, U.S. Treasury Notes and other municipal bonds, the majority of which are rated Aa3 or better. The fair value of money market funds is measured using quoted market prices; therefore they are classified as Level 1 assets. The fair values of the U.S. Treasury Note s and municipal bonds are measured using readily available pricing sou rces for comparable instruments; therefore, they are classified as Level 2 assets.
| (c) |  | The Company valued the interest rate swap liability utilizing a discounted cash flow model that took into consideration forward interest rates observable in the market and the counterparty’s credit risk.
﻿
Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis | ﻿
﻿ |  |
﻿ |  |
﻿ | Contingent
﻿(in thousands) | Consideration
﻿Balance as of December 31, 2014 | $ | 24,814
﻿Fair value adjustments included in other income (expense), net |  | (3,739)
﻿Amount no longer subject to contingency |  | (21,075)
﻿Balance as of December 31, 2015 | $ | —
﻿ ﻿

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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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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