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Mortgages, Loans Payable And Other Obligations (Narrative) (Details) (USD $)
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6 Months Ended | ||
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Jun. 30, 2013
property
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Jun. 30, 2012
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Dec. 31, 2012
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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 | $ 995,000,000 | ||
| Cash paid for interest | 60,838,000 | 61,144,000 | |
| Interest capitalized | 6,748,000 | 536,000 | |
| Total indebtedness | 2,369,153,000 | 2,204,389,000 | |
| Total indebtedness, weighted average interest rate | 5.64% | 5.86% | |
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Revolving Credit Facility Borrowings And Other Variable Rate Mortgage Debt [Member]
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| Mortgages Loans Payable And Other Obligations [Line Items] | |||
| Total indebtedness | 78,855,000 | 77,057,000 | |
| Total indebtedness, weighted average interest rate | 3.32% | 3.32% | |
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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 | $ 2,290,298,000 | $ 2,127,332,000 | |
| Total indebtedness, weighted average interest rate | 5.72% | 5.95% | |