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Indebtedness (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 item | Dec. 31, 2012 | Mar. 31, 2013 Unsecured revolving credit facility | May 31, 2013 Unsecured revolving credit facility | Mar. 31, 2013 Senior unsecured notes 4.30% | Mar. 31, 2013 Senior unsecured notes 6.75% | Mar. 31, 2013 Senior unsecured notes 6.75% maturing in 2021 | Mar. 31, 2013 Senior unsecured notes 5.625% due in 2042 | Mar. 31, 2013 Mortgages item | Mar. 31, 2013 Mortgages Significant Unobservable Inputs (Level 3) | Mar. 31, 2013 Capital leases item
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  | $ 750,000 |  |  |  |  |  |  |  |
Number of public issues of unsecured senior notes | 4 |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes | 1,092,374 | 1,092,053 |  |  | 250,000 | 200,000 | 300,000 | 350,000 |  |  |
Aggregate principal amount of mortgage debt |  |  |  |  |  |  |  |  | 714,439 |  |
Interest rate (as a percent) |  |  |  |  | 4.30% | 6.75% | 6.75% | 5.625% | 6.25% |  |
Number of properties mortgaged |  |  |  |  |  |  |  |  | 57 |  |
Carrying value of mortgaged properties | 4,479,229 | 4,432,404 |  |  |  |  |  |  | 983,479 |  | 18,124
Mortgage debt assumed in connection with real estate acquisitions | 12,266 |  |  |  |  |  |  |  |  | 12,266 |
Fair value of mortgage notes payable |  |  |  |  |  |  |  |  |  | 13,306 |
Increase (decrease) in outstanding principal balances |  |  |  |  |  |  |  |  |  | 1,040 |
Number of properties recorded under capital lease |  |  |  |  |  |  |  |  |  |  | 2
Capital leases |  |  |  |  |  |  |  |  |  |  | 13,676
Extension period of revolving credit facility |  |  | 1 year |  |  |  |  |  |  |  |
Option to increase the borrowing capacity under revolving credit facility |  |  | 1,500,000 |  |  |  |  |  |  |  |
Interest rate, description |  |  | LIBOR |  |  |  |  |  |  |  |
Interest rate added to the base rate (as a percent) |  |  | 1.60% |  |  |  |  |  |  |  |
Debt instrument, facility fee (as a percent) |  |  | 0.35% |  |  |  |  |  |  |  |
Principal repayment due until maturity |  |  | 0 |  |  |  |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  | 1.70% |  |  |  |  |  |  |  |
Interest expense and other associated costs incurred |  |  | 231 |  |  |  |  |  |  |  |
Unsecured revolving credit facility, amount outstanding |  |  | 0 |  |  |  |  |  |  |  |
Revolving credit facility, available amount |  |  | $ 750,000 | $ 750,000 |  |  |  |  |  |  |

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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 -Section 03 -Paragraph 16 -Article 7 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 fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + 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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: 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 Reference 4: 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. + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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