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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2016
Fair Value Measurements [Abstract] |
Fair Value Measurements | (10) Fair Value Measurements ﻿ The fair value hierarchy established by ASC 820, Fair Value Measurements, prioritizes the use of inputs used in valuation techniques into the following three levels: ﻿ Level 1 — quoted prices in active markets for identical assets or liabilities Level 2 — inputs are other than Level 1 inputs that are observable, either directly or indirectly Level 3 — unobserv able inputs ﻿ The following is a summary of financial statement items carried at estimated fair values measured on a recurring basis as of the dates presented: ﻿
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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 |  | $ | —
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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.
﻿ The Company did not have transfers between Levels 1 and 2 for either financial assets or liabilities, during the three and nine months ended September 30, 2016 or 2015. ﻿ The carrying amount of cash and cash equivalents approximates fair value due to the short-term nature of these items. The carrying value of receivables, payables and other amounts arising out of normal contract activities, including retainage, which may be settled beyond one year, is estimated to approximate fair value. Of the Company’s long-term debt, the fair value of the 2010 Notes was $302.3 million and $305.6 million as of September 30, 2016 and December 31, 2015, respectively, and the fair value of the Convertible Notes was $207.8 million as of September 30, 2016; the fair values were determined using Level 1 inputs, specifically current observable market prices. The reported value of the Company’s remaining long-term debt at September 30, 2016 and December 31, 2015 approximates fair value. ﻿ The fair value of the liability component of the Convertible Notes as of the issuance date of June 15, 2016 was $153.2 million, which was determined using a b inomial l attice approach based on Level 2 inputs, specifically quoted prices in active markets for similar debt instruments that do not have a conversion feature. See Note 5 for additional information related to the Company’s Convertible Notes.

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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 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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