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Long-Term Debt (Term Loan And Revolver) (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Nov. 09, 2011
Dec. 31, 2011
Old Term Loan [Member]
Dec. 31, 2010
Old Term Loan [Member]
Dec. 31, 2011
Old Term Loan [Member]
Dec. 31, 2010
Old Term Loan [Member]
Nov. 09, 2011
Term Loan [Member]
Dec. 31, 2011
Term Loan [Member]
Dec. 31, 2011
Term Loan [Member]
Nov. 09, 2011
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Dec. 31, 2011
LIBOR [Member]
Term Loan [Member]
Debt Instrument [Line Items]                      
Credit agreement, maximum capacity $ 700,000,000           $ 600,000,000 $ 600,000,000   $ 100,000,000  
Debt instrument, face amount           600,000,000          
Term loan period, years           5 years          
Revolver credit agreement term, years                 5 years    
Quarterly scheduled principal payment               7,500,000      
Term loan repayment as percentage of principal in year 1               1.25%      
Term loan repayment as percentage of principal in year 2               1.25%      
Term loan repayment as percentage of principal in year 3               1.88%      
Term loan repayment as percentage of principal in year 4               1.88%      
Term loan repayment as percentage of principal in year 5               2.50%      
Repayment of line of credit debt 332,900,000                    
Interest addition to floating rate                     2.50%
Interest expense   $ 900,000 $ 1,800,000 $ 2,700,000 $ 3,700,000   $ 2,500,000 $ 2,500,000