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Indebtedness (Details) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 item | Dec. 31, 2013 | Mar. 31, 2014 Unsecured revolving credit facility | May 02, 2014 Unsecured revolving credit facility Subsequent event | Mar. 31, 2014 Senior unsecured notes 4.30% | Mar. 31, 2014 Senior unsecured notes 6.75% | Mar. 31, 2014 Senior unsecured notes 6.75% maturing in 2021 | Mar. 31, 2014 Senior unsecured notes 5.625% due in 2042 | Mar. 31, 2014 Mortgages building property | Mar. 31, 2014 Capital leases property | Apr. 30, 2014 Senior unsecured notes due 2019 Subsequent event | Apr. 30, 2014 Senior unsecured notes due 2024 Subsequent event
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity | $ 750 |  | $ 750,000 |  |  |  |  |  |  |  |  |
Number of public issues of unsecured senior notes | 4 |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes | 1,093,658 | 1,093,337 |  |  | 250,000 | 200,000 | 300,000 | 350,000 |  |  |  |
Aggregate principal amount of mortgage debt |  |  |  |  |  |  |  |  | 678,514 |  |  |
Interest rate (as a percent) |  |  |  |  | 4.30% | 6.75% | 6.75% | 5.625% |  |  | 3.25% | 4.75%
Number of buildings mortgaged |  |  |  |  |  |  |  |  | 51 |  |  |
Number of properties mortgaged |  |  |  |  |  |  |  |  | 48 |  |  |
Number of properties recorded under capital lease |  |  |  |  |  |  |  |  |  | 2 |  |
Carrying value of mortgaged properties | 4,410,178 | 4,422,865 |  |  |  |  |  |  | 941,064 | 18,534 |  |
Capital leases |  |  |  |  |  |  |  |  |  | 13,181 |  |
Extension period of revolving credit facility |  |  | 1 year |  |  |  |  |  |  |  |  |
Principal repayment due until maturity |  |  | 0 |  |  |  |  |  |  |  |  |
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) |  |  | 1.30% |  |  |  |  |  |  |  |  |
Debt instrument, facility fee (as a percent) |  |  | 0.30% |  |  |  |  |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  | 1.42% |  |  |  |  |  |  |  |  |
Interest expense and other associated costs incurred |  |  | 425 |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, amount outstanding |  |  | 145,000 | 0 |  |  |  |  |  |  |  |
Revolving credit facility, available amount |  |  | 605,000 | 750,000 |  |  |  |  |  |  |  |
Sale of senior unsecured notes |  |  |  |  |  |  |  |  |  |  | 400,000 | 250,000
Net proceeds after underwriting discounts from sale of senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  | $ 644,889

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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 Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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