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Consolidated Statements Of Income (Parenthetical)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Consolidated Statements Of Income        
Debt instrument, interest rate, stated percentage 6.00% 6.00% 6.00% 6.00%
Debt instrument, maturity date Apr. 01, 2012 Apr. 01, 2012 Apr. 01, 2012 Apr. 01, 2012