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Mortgages, Loans Payable And Other Obligations (Narrative) (Details) (USD $)
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9 Months Ended | ||
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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| Mortgages Loans Payable And Other Obligations [Line Items] | |||
| Number of properties with encumbered company mortgages | 30 | ||
| Book value of encumbered properties | $ 879,800,000 | ||
| Cash paid for interest | 98,191,000 | 99,089,000 | |
| Interest capitalized | 1,427,000 | 875,400 | |
| Total indebtedness | 1,970,254,000 | 1,914,215,000 | |
| Total indebtedness, weighted average interest rate | 6.19% | 6.46% | |
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Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
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| Mortgages Loans Payable And Other Obligations [Line Items] | |||
| Total indebtedness | 78,000,000 | 66,500,000 | |
| Total indebtedness, weighted average interest rate | 1.59% | 1.77% | |
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Fixed Rate Debt And Other Obligations [Member]
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| Mortgages Loans Payable And Other Obligations [Line Items] | |||
| Total indebtedness | $ 1,892,254,000 | $ 1,847,715,000 | |
| Total indebtedness, weighted average interest rate | 6.38% | 6.63% | |