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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2012
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, short-term investments, accounts receivable, accounts payable and accrued expenses. The carrying value of these financial instruments approximates their fair value. Cash equivalents consist of highly liquid investments with a maturity of three months or less at date of purchase. Cash and cash equivalents consist of the following:
 
September 30, 2012
 
December 31, 2011
 
Cost
 
Fair Value
 
Cost
 
Fair Value
Cash and Cash Equivalents:
 
 
 
 
 
 
 
Cash and overnight deposits
$
546,142

 
$
546,142

 
$
445,586

 
$
445,586

Corporate commercial paper
769,317

 
769,624

 
791,729

 
791,902

Time deposits
52,183

 
52,183

 
57,041

 
57,041

Total cash and cash equivalents
1,367,642

 
1,367,949

 
1,294,356

 
1,294,529


The fair value of corporate commercial paper is based on the use of market interest rates for identical or similar assets.