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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments

(3)
Fair Value of Financial Instruments
The fair value of certain of the Company’s financial instruments, including cash and cash equivalents, trade receivables and accounts payable, approximates their respective carrying amounts due to their short-term maturity.
The fair value of investments is based on market prices using the following measurement categories:
Level 1 – Fair value is determined by using quoted prices in active markets for identical investments. Investments included in this category are equity securities (exchange traded funds and individual equity securities) and a restricted investment held as collateral (money market/mutual fund), collectively referred to as equity securities.
Level 2 – Fair value is determined by using other than quoted prices. By using observable inputs (for example, benchmark yields, interest rates, reported trades and broker dealer quotes), the fair value is determined through processes such as benchmark curves, benchmarking of like securities and matrix pricing of corporate, state and municipal bonds by using pricing of similar bonds based on coupons, ratings and maturities. Investments included in this category are primarily debt securities (tax exempt and taxable bonds).
Level 3 – Fair value is determined by using other than observable inputs. Fair value is determined by using the best information available in the circumstances and requires significant management judgment or estimation. No investments are currently included in this category.
Following is a summary of fair value measurements for investments as of June 30, 2018 and December 30, 2017:
 
 
Fair Value
 
Level 1
 
Level 2
 
Level 3
 
 
(Amounts are in thousands)
June 30, 2018
 
$
6,628,889

 
2,774,860

 
3,854,029

 

December 30, 2017
 
6,433,311

 
2,545,320

 
3,887,991