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Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details)
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12 Months Ended |
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Dec. 31, 2011
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No Ratings Or Less Than BBB-/Baa3 [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
No ratings or less than BBB-/Baa3 |
| Interest Rate - Applicable Basis Points Above LIBOR |
185.0 |
| Facility Fee Basis Points |
45.0 |
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BBB- Or Baa3 [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
BBB- or Baa3 |
| Interest Rate - Applicable Basis Points Above LIBOR |
150.0 |
| Facility Fee Basis Points |
35.0 |
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BBB Or Baa2 (Current) [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
BBB or Baa2(current) |
| Interest Rate - Applicable Basis Points Above LIBOR |
125.0 |
| Facility Fee Basis Points |
25.0 |
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BBB+ Or Baa1 [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
BBB+or Baa1 |
| Interest Rate - Applicable Basis Points Above LIBOR |
107.5 |
| Facility Fee Basis Points |
20.0 |
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A- Or A3 Or Higher [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
A-or A3 or higher |
| Interest Rate - Applicable Basis Points Above LIBOR |
100.0 |
| Facility Fee Basis Points |
17.5 |