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Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details) (Unsecured Revolving Credit Facility [Member])
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3 Months Ended |
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Mar. 31, 2015
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No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]
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| Line of Credit Facility [Line Items] |
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| Unsecured Debt Ratings |
No ratings or less than BBB-/Baa3 |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.70% |
| Facility Fee Basis Points |
0.35% |
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Baa3 [Member] | BBB- [Member]
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| Line of Credit Facility [Line Items] |
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| Unsecured Debt Ratings |
BBB- or Baa3 (current) |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.30% |
| Facility Fee Basis Points |
0.30% |
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Baa2 [Member] | BBB [Member]
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| Line of Credit Facility [Line Items] |
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| Unsecured Debt Ratings |
BBB or Baa2 |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.10% |
| Facility Fee Basis Points |
0.20% |
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Baa1 [Member] | BBB+ [Member]
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| Line of Credit Facility [Line Items] |
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| Unsecured Debt Ratings |
BBB+ or Baa1 |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.00% |
| Facility Fee Basis Points |
0.15% |
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A3 Or Higher [Member] | A- Or Higher [Member]
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| Line of Credit Facility [Line Items] |
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| Unsecured Debt Ratings |
A- or A3 or higher |
| Interest Rate - Applicable Basis Points Above LIBOR |
0.925% |
| Facility Fee Basis Points |
0.125% |