| Unsecured Revolving Credit Facility (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2013 | ||||||||||||||||||||||||||||||||||||||||||||||
| Debt Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Change In The Operating Partnership's Unsecured Debt Ratings | 
 
 
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- Definition Schedule of Unsecured Credit Rating, Operating Partnerships [Table Text Block] No definition available. 
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- Details 
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