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Fair Value Measurements of Financial Instruments | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Fair Value Measurements of Financial Instruments | Fair Value Measurements of Financial Instruments For recognition purposes, on a recurring basis, the Corporation is required to measure at fair value its marketable securities, derivative financial instruments, variable-rate and fixed-rate debt obligations, and deferred stock-based compensation. The marketable securities are comprised of money market funds, government securities, and corporate bonds. When available, the Corporation uses quoted market prices to determine fair value and classifies such measurements within Level 1. Where market prices are not available, the Corporation makes use of observable market-based inputs (prices or quotes from published exchanges and indexes) to calculate fair value using the market approach, in which case the measurements are classified within Level 2. Financial instruments measured at fair value were as follows (in thousands):
| Fair value as of measurement date |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
Balance as of June 30, 2018 |  |  |  |  |  |  |
Cash and cash equivalents (including money market funds) (1) | $ | 31,065 |  |  | $ | 31,065 |  |  | $ | — |  |  | $ | — |
Government securities (2) | $ | 6,905 |  |  | $ | — |  |  | $ | 6,905 |  |  | $ | — |
Corporate bonds (2) | $ | 5,425 |  |  | $ | — |  |  | $ | 5,425 |  |  | $ | — |
Derivative financial instruments (3) | $ | 5,146 |  |  | $ | — |  |  | $ | 5,146 |  |  | $ | — |
Variable-rate debt obligations (4) | $ | 197,000 |  |  | $ | — |  |  | $ | 197,000 |  |  | $ | — |
Fixed-rate debt obligations (4) | $ | 100,000 |  |  | $ | — |  |  | $ | 100,000 |  |  | $ | — |
Deferred stock-based compensation (5) | $ | 8,901 |  |  | $ | — |  |  | $ | 8,901 |  |  | $ | — |
Balance as of December 30, 2017 |  |  |  |  |  |  |
Cash and cash equivalents (including money market funds) (1) | $ | 23,348 |  |  | $ | 23,348 |  |  | $ | — |  |  | $ | — |
Government securities (2) | $ | 6,345 |  |  | $ | — |  |  | $ | 6,345 |  |  | $ | — |
Corporate bonds (2) | $ | 6,149 |  |  | $ | — |  |  | $ | 6,149 |  |  | $ | — |
Derivative financial instruments (3) | $ | 3,354 |  |  | $ | — |  |  | $ | 3,354 |  |  | $ | — |
Variable-rate debt obligations (4) | $ | 267,500 |  |  | $ | — |  |  | $ | 267,500 |  |  | $ | — |
Deferred stock-based compensation (5) | $ | 8,885 |  |  | $ | — |  |  | $ | 8,885 |  |  | $ | — |
The index below indicates the line item in the Condensed Consolidated Balance Sheets where the financial instruments are reported: (1) "Cash and cash equivalents" (2) Current portion - "Short-term investments"; Long-term portion - "Other Assets" (3) Current portion - "Prepaid expenses and other current assets"; Long-term portion - "Other Assets" (4) Current portion - "Current maturities of long-term debt"; Long-term portion - "Long-Term Debt" (5) Current portion - "Current maturities of other long-term obligations"; Long-term portion - "Other Long-Term Liabilities"

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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