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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2017
Fair Value Measurements [Abstract] |
Fair Value Measurements | 10. Fair Value Measurements ﻿ The fair value hierarchy established by ASC 820 prioritizes the use of inputs used in valuation techniques into the following three levels: ﻿  Level 1 inputs are observable quoted prices in active markets for identical assets or liabilities  Level 2 inputs are observable, either directly or indirectly, but are not Level 1 inputs  Level 3 inputs are unobservable ﻿ The following fair value hierarchy table presents the Company’s assets that are measured at fair value on a recurring basis as of December 31, 201 7 and 201 6: ﻿
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2017 |  | As of December 31, 2016
﻿ | 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) |  | $ | 192,868 |  | $ | — |  | $ | — |  | $ | 192,868 |  | $ | 146,103 |  | $ | — |  | $ | — |  | $ | 146,103
﻿Restricted cash(a) |  |  | 4,780 |  |  | — |  |  | — |  |  | 4,780 |  |  | 50,504 |  |  | — |  |  | — |  |  | 50,504
﻿Investments in lieu of retainage(b) |  |  | 69,891 |  |  | 2,405 |  |  | — |  |  | 72,296 |  |  | 46,855 |  |  | 4,411 |  |  | — |  |  | 51,266
﻿Total |  | $ | 267,539 |  | $ | 2,405 |  | $ | — |  | $ | 269,944 |  | $ | 243,462 |  | $ | 4,411 |  | $ | — |  | $ | 247,873
(a)Includes money market funds with original maturity dates of three months or less. (b)Investments in lieu of retainage are included in accounts 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. ﻿ The Company did no t have material transfers between Levels 1 and 2 during the years ended December 31, 2017 and 2016. ﻿ The carrying values of receivables, payables and other amounts arising out of normal contract activities, including retainage, which may be settled beyond one year, are estimated to approximate fair value. The Company’s restricted investments carried at amortized cost have an aggregate fair value of $52.5 million as of December 31, 2017, determined using Level 2 inputs. Of the Company’s long-term debt, the fair values of the 2017 Senior Notes as of December 31, 2017 was $537.5 million. The fair value of the 2010 Senior Notes as of December 31, 2016 was $302.6 million; the 2010 Senior Notes were redeemed in the second quarter of 2017, as discussed in Note 5. The fair value of the Convertible Notes was $222.2 million and $228.4 million as of December 31, 2017 and 2016, respectively. The fair values of the 2017 Senior Notes, 2010 Senior Notes and Convertible Notes were determined using Level 1 inputs, specifically current observable market prices. The reported value of the Company’s remaining borrowings as of December 31, 2017 and 2016 approximates fair value.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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