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Financial Instruments Schedule Of Significant Inputs And Assumptions Used To Determine Fair Value of ARS (Tables)
 6 Months Ended
Jun. 30, 2012
Financial Instruments [Abstract]  
Schedule Of Significant Inputs And Assumptions Used To Determine Fair Value Of Available-For-Sale Securities [Table Text Block]
 
Quarter Ended
 
June 30,
2012
 
December 31,
2011
Discount rate for periodic interest payments
1.07
%
 
1.13
%
Discount rate for principal repayments
1.66
%
 
1.93
%
Liquidity discount
0.90
%
 
0.90
%
Credit discount
2.00
%
 
2.00
%
Estimated period (years)
17

 
17