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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2013
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:
 
March 31, 2013
 
December 31, 2012
 
Cost
 
Fair Value
 
Cost
 
Fair Value
Cash and Cash Equivalents:
 
 
 
 
 
 
 
Cash and overnight deposits
$
504,651

 
$
504,651

 
$
458,169

 
$
458,169

Corporate commercial paper
736,539

 
736,746

 
642,884

 
642,886

Time deposits
153,497

 
153,497

 
159,789

 
159,789

Total cash and cash equivalents
$
1,394,687

 
$
1,394,894

 
$
1,260,842

 
$
1,260,844