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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Schedule of Fair value of Cash and Cash Equivalents by Balance Sheet Grouping
Cash and cash equivalents consist of the following:
 
 
December 31, 2012
 
December 31, 2011
 
 
Cost
 
Fair Value
 
Cost
 
Fair Value 
Cash and cash equivalents:
 
 
 
 
 
 
 
 
Cash and overnight deposits
 
$
458,169

 
$
458,169

 
$
445,586

 
$
445,586

Corporate commercial paper
 
642,884

 
642,886

 
791,729

 
791,902

Time deposits
 
159,789

 
159,789

 
57,041

 
57,041

Total cash and cash equivalents
 
1,260,842

 
1,260,844

 
1,294,356

 
1,294,529