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Fair Value Measurements (Details 5) (ARS, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2012
Sep. 30, 2012
item
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
ARS
             
Changes in Level 3 assets measured at fair value on recurring basis              
Beginning balance $ 62,311 $ 62,311 $ 46,283 $ 46,283 $ 46,283 $ 46,283 $ 46,283
Settlements (16,553)            
Realized loss included in other income (expense), net (2,699)            
Reversal of pretax impairment charges included in accumulated other comprehensive income (loss) 3,224            
Ending balance $ 46,283 $ 46,283 $ 46,283 $ 46,283 $ 46,283 $ 46,283 $ 46,283
Number of auction rate securities sold or redeemed for full par value   1          
Number of auction rate securities (ARS) sold in a secondary market   2          
Number of auction rate securities (ARS) settled   3