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Derivative Instruments and Hedging Activities Narrative (Details) - Interest Rate Swap | Apr. 30, 2010 contract | Apr. 01, 2010 Contract
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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%

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