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Derivative Instruments and Hedging Activities Narrative (Details) - Interest Rate Swap
Apr. 30, 2010
contract
Apr. 01, 2010
Contract
Derivative Instruments and Hedging Activities (Textual) [Abstract]    
Number of interest rate swap agreements 2 2
First Half of Mortgage    
Derivative Instruments and Hedging Activities (Textual) [Abstract]    
Strike rate   5.90%
Second Half of Mortgage    
Derivative Instruments and Hedging Activities (Textual) [Abstract]    
Strike rate   6.10%