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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2011
Fair value of Cash, Cash Equivalents and Short Term investments, by Balance Sheet Grouping
Cash, cash equivalents and short-term investments consist of the following:
 
 
December 31, 2011
 
December 31, 2010
 
 
Cost
 
Fair Value
 
Cost
 
Fair Value 
Cash and cash equivalents:
 
 
 
 
 
 
 
 
Cash and overnight deposits
 
$
445,586

 
$
445,586

 
$
443,716

 
$
443,716

Corporate commercial paper
 
791,729

 
791,902

 
571,260

 
571,373

Time deposits
 
57,041

 
57,041

 
69,489

 
69,489

Total cash and cash equivalents
 
1,294,356

 
1,294,529

 
1,084,465

 
1,084,578

Short-term investments:
 
 
 
 
 
 
 
 
Time deposits
 
472

 
472

 
524

 
524

Total
 
$
1,294,828

 
$
1,295,001

 
$
1,084,989

 
$
1,085,102