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Consolidated Statements Of Income (Parenthetical)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Consolidated Statements Of Income [Abstract]    
Debt instrument, interest rate, stated percentage6.00%6.00%6.00%6.00%
Debt instrument, maturity dateApr. 01, 2012Apr. 01, 2012Apr. 01, 2012Apr. 01, 2012