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Fair Value of Financial Instruments
12 Months Ended
Dec. 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. Cash and cash equivalents consist of the following:
 
 
December 31, 2018
 
December 31, 2017
 
 
Cost
 
Fair Value
 
Cost
 
Fair Value 
Cash and cash equivalents:
 
 
 
 
 
 
 
 
Cash and overnight deposits
 
$
427,307

 
427,307

 
383,021

 
383,021

Corporate commercial paper
 
467,300

 
467,760

 
635,345

 
635,919

Time deposits
 
29,128

 
29,128

 
32,733

 
32,733

Total cash and cash equivalents
 
923,735

 
924,195

 
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).