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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		5.91%
Second half of mortgage
Derivative Instruments and Hedging Activities (Textual) [Abstract]
Strike rate		6.07%

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- Definition

Derivative instruments and hedging activities.

+ References

No definition available.

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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)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

The number of derivative instruments of a particular group held by the entity.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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