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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
The Company’s financial instruments, other than cash, consist primarily of cash equivalents, accounts receivable, accounts payable and accrued expenses. The carrying value of these financial instruments approximates their fair value. All highly liquid investments with a maturity of three months or less at date of purchase are considered to be cash equivalents.
Cash and cash equivalents consist of the following:
 
September 30, 2017
 
December 31, 2016
 
Cost
 
Fair Value
 
Cost
 
Fair Value
Cash and Cash Equivalents:
 
 
 
 
 
 
 
Cash and overnight deposits
$
385,432

 
385,432

 
406,787

 
406,787

Corporate commercial paper
613,433

 
613,825

 
507,777

 
507,889

Time deposits
34,579

 
34,579

 
59,871

 
59,871

Total cash and cash equivalents
$
1,033,444

 
1,033,836

 
974,435

 
974,547


The fair value of corporate commercial paper and time deposits is based on the use of market interest rates for identical or similar assets (Level 2 fair value measurement).