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Long-Term Debt (Bank Credit Facility) (Narrative) (Details) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Sep. 30, 2012
Bank Credit Facility [Member]
Dec. 31, 2012
Bank Credit Facility [Member]
Dec. 31, 2012
Bank Credit Facility [Member]
Long-term Debt [Member]
Dec. 31, 2012
Bank Credit Facility [Member]
Other Assets [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Bank Credit Facility [Member]
Dec. 31, 2012
Term Loan [Member]
Dec. 31, 2012
Term Loan [Member]
Bank Credit Facility [Member]
Oct. 21, 2010
Same-Day Swing Line Loan [Member]
Bank Credit Facility [Member]
Oct. 21, 2010
Stand-By Letters Of Credit [Member]
Bank Credit Facility [Member]
Dec. 31, 2012
Principal Payment Through September 30, 2015 [Member]
Term Loan [Member]
Bank Credit Facility [Member]
Dec. 31, 2012
Principal Payment From October 1, 2015 Through September 30, 2016 [Member]
Term Loan [Member]
Bank Credit Facility [Member]
Debt Instrument [Line Items]                            
Unamortized debt issuance expense $ 4,299,000 $ 4,654,000     $ 3,400,000 $ 1,600,000                
Credit facility, amount outstanding 290,000,000 125,000,000           290,000,000            
Credit facility maximum borrowing capacity       900,000,000       750,000,000   150,000,000 50,000,000 25,000,000    
Loan maturity date             Nov. 18, 2016   Nov. 18, 2016          
Term loan period 5 years                          
Term loan principal payment                         1,900,000 3,800,000
Term loan maximum additional borrowing capacity     150,000,000                      
Outstanding borrowings interest rate       1.71%                    
Debt issuance cost capitalized       $ 7,900,000