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Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended9 Months Ended
Oct. 31, 2011
Sep. 30, 2011
Revolving line of credit$ 500 
Terminated line of credit350 
Increased line of credit subject to satisfaction of specified conditions 570
Line of credit facility, maturity date October 21, 2016
Line of credit facility, interest rate (1) the alternate base rate (defined as the highest of (i) the Wells Fargo Bank, National Association prime rate, (ii) the Federal Funds Rate plus 1/2 of 1% and (iii) one month LIBOR plus 1%) or (2) the LIBOR rate, as defined in the Amended and Restated Line of Credit, plus, an applicable margin rate ranging from 0.125% to 0.5% for alternate base rate borrowings and 1.125% to 1.5% for LIBOR rate borrowings, in each case based on the Company's consolidated leverage ratio.
Line of credit facility base rate over federal funds rate 1/2 of 1%
Maximum [Member]
  
Line of credit facility base rate margin 0.50%
Line of credit facility LIBOR rate margin 1.50%
Minimum [Member]
  
Line of credit facility base rate margin 0.125%
Line of credit facility LIBOR rate margin 1.125%
Letters Of Credit [Member]
  
Revolving line of credit 50
Swingline Loans [Member]
  
Revolving line of credit $ 25