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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2018
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:
 
March 31, 2018
 
December 31, 2017
 
Cost
 
Fair Value
 
Cost
 
Fair Value
Cash and Cash Equivalents:
 
 
 
 
 
 
 
Cash and overnight deposits
$
452,028

 
452,028

 
383,021

 
383,021

Corporate commercial paper
643,085

 
644,225

 
635,345

 
635,919

Time deposits
37,788

 
37,788

 
32,733

 
32,733

Total cash and cash equivalents
$
1,132,901

 
1,134,041

 
1,051,099

 
1,051,673


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).