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Mortgages, Loans Payable And Other Obligations (Narrative) (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
property
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Dec. 31, 2012
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Dec. 31, 2011
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| Debt Instrument [Line Items] | |||
| Number of properties with encumbered company mortgages | 29 | ||
| Book value of encumbered properties | $ 916,000,000 | ||
| Cash paid for interest | 123,213,000 | 120,089,000 | 116,772,000 |
| Interest capitalized | 12,885,000 | 4,342,000 | 1,081,000 |
| Total indebtedness | 2,362,766,000 | 2,204,389,000 | |
| Total indebtedness, weighted average interest rate | 5.62% | 5.86% | |
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Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
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| Debt Instrument [Line Items] | |||
| Total indebtedness | 80,228,000 | 77,057,000 | |
| Total indebtedness, weighted average interest rate | 2.74% | 3.32% | |
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Fixed Rate Debt And Other Obligations [Member]
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| Debt Instrument [Line Items] | |||
| Total indebtedness | 2,282,538,000 | 2,127,332,000 | |
| Total indebtedness, weighted average interest rate | 5.72% | 5.95% | |
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Unconsolidated Joint Venture [Member]
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| Debt Instrument [Line Items] | |||
| Interest capitalized | $ 1,326,000 | $ 235,000 | $ 0 |