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Fair Value Measurements and Auction Rate Securities (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Measurements and Auction Rate Securities [Abstract]  
Fair Value, Assets Measured on Recurring Basis
The following table presents the auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the interim periods presented (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
 
 
 
 
 
 
 
 
Balance as of April 1 and January 1, respectively
$
1,956

 
$
1,975

 
$
1,956

 
$
2,001

Total gains (realized or unrealized):
 

 
 

 
 

 
 
Recognized gains included in earnings (1)

 

 

 
9

Settlements
(450
)
 

 
(450
)
 
(35
)
Balance as of June 30
$
1,506

 
$
1,975

 
$
1,506

 
$
1,975

(1) Total realized gains on redemptions or partial redemptions at par of auction rate securities for the periods presented.