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Indebtedness (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2011 property segment Y count state | Sep. 30, 2011 property segment Y count state | Sep. 30, 2010 | Dec. 31, 2010 | Sep. 30, 2011 Unsecured revolving credit facility | Jun. 30, 2011 Unsecured revolving credit facility | Jun. 30, 2011 Previous unsecured revolving credit facility | Sep. 30, 2011 Senior unsecured notes 8.625% | Sep. 30, 2011 Senior unsecured notes 4.30% | Sep. 30, 2011 Senior unsecured notes 6.75% | Sep. 30, 2011 Mortgages property | Sep. 30, 2011 Capital leases property
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed | $ 28,869 | $ (76,931) | $ (2,458) |  |  |  |  |  |  |  |  |
Weighted average interest rate on mortgage debt assumed (as a percent) | 6.16% | 6.16% |  |  |  |  |  |  |  |  |  |
Weighted average maturity period of mortgage debt assumed (in years) | 5.3 | 5.3 |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  |  |  | 750,000 | 750,000 | 550,000 |  |  |  |  |
Number of public issuances of unsecured senior notes (in counts) | 3 | 3 |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes | 670,849 | 670,849 |  | 422,880 |  |  |  | 225,000 | 250,000 | 200,000 |  |
Interest rate on real estate mortgage loan (as a percent) |  |  |  |  |  |  |  | 8.625% | 4.30% | 6.75% |  |
Aggregate principal amount of mortgage debt |  |  |  |  |  |  |  |  |  |  | 709,624 |
Number of properties mortgaged |  |  |  |  |  |  |  |  |  |  | 73 |
Carrying value of properties | 3,691,512 | 3,691,512 |  | 3,222,840 |  |  |  |  |  |  | 872,574 | 14,304
Number of properties recorded under capital lease |  |  |  |  |  |  |  |  |  |  |  | 2
Capital leases |  |  |  |  |  |  |  |  |  |  |  | 16,562
Interest rate, description |  |  |  |  | LIBOR |  |  |  |  |  |  |
Revolving credit facility, interest rate payable (as a percent) |  |  |  |  | 1.80% |  |  |  |  |  |  |
Unsecured revolving credit facility, amount outstanding |  |  |  |  | 210,000 |  |  |  |  |  |  |
Revolving credit facility, available amount |  |  |  |  | $ 540,000 |  |  |  |  |  |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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