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Credit Facilities (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended
Nov. 30, 2011
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Revolving Credit Facility [Member]
Mar. 31, 2012
Previous Revolving Credit Facility [Member]
Mar. 31, 2012
Prime Rate Or One Month LIBOR [Member]
Mar. 31, 2012
Federal Funds Rate [Member]
Mar. 31, 2012
Uncommitted lines of credit [Member]
Mar. 31, 2011
Uncommitted lines of credit [Member]
Mar. 31, 2012
Unused Lines Of Credit [Member]
Debt Instrument [Line Items]                    
Number Of Years Of Bank Credit Agreement 5                  
Amount under revolving credit facility $ 450,000,000       $ 400,000,000          
Fully funded amortizing term loan 100,000,000                  
Margin rate on credit           1.00% 0.50%      
Expiration date of revolving credit facility         8/31/2012          
Maturity date of credit facility       Nov. 01, 2016            
Amount Outstanding under revolving credit facility   0                
Outstanding uncommitted lines of credit   $ 128,016,000 $ 149,291,000         $ 128,000,000 $ 149,000,000 $ 385,000,000
Weighted average interest rates on short-term borrowings outstanding   7.10% 4.20%