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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Measurements [Abstract] |
Assets and Liabilities Measured at Fair Value on Recurring Basis |
|  | December 31, 2015 |  | December 31, 2014
|  | 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) |  | $ | 75,452 |  | $ | 75,452 |  | $ | — |  | $ | — |  | $ | 135,583 |  | $ | 135,583 |  | $ | — |  | $ | —
Restricted cash (a) |  |  | 45,853 |  |  | 45,853 |  |  | — |  |  | — |  |  | 44,370 |  |  | 44,370 |  |  | — |  |  | —
Investments in lieu of customer retainage (b) |  |  | 41,566 |  |  | 35,350 |  |  | 6,216 |  |  | — |  |  | 33,224 |  |  | 25,761 |  |  | 7,463 |  |  | —
Total |  | $ | 162,871 |  | $ | 156,655 |  | $ | 6,216 |  | $ | — |  | $ | 213,177 |  | $ | 205,714 |  | $ | 7,463 |  | $ | —
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract (c) |  | $ | 45 |  | $ | — |  | $ | 45 |  | $ | — |  | $ | 381 |  | $ | — |  | $ | 381 |  | $ | —
Contingent consideration (d) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 24,814 |  |  | — |  |  | — |  |  | 24,814
Total |  | $ | 45 |  | $ | — |  | $ | 45 |  | $ | — |  | $ | 25,195 |  | $ | — |  | $ | 381 |  | $ | 24,814
| (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 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 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 credit risk.
Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis |
| Contingent
(in thousands) | Consideration
Balance as of December 31, 2013 | $ | 46,022
Fair value adjustments included in other income (expense), net |  | 5,592
Amount no longer subject to contingency |  | (26,800)
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 | $ | —
| Auction Rate
(in thousands) | Securities
Balance as of December 31, 2013 | $ | 46,283
Purchases |  | —
Settlements |  | (44,497)
Realized loss included in other income (expense), net |  | (1,786)
Balance as of December 31, 2014 | $ | —

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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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