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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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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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