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Indebtedness (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 0 Months Ended |
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Jun. 30, 2014 item | Jun. 30, 2014 item | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Unsecured revolving credit facility | Jun. 30, 2013 Unsecured revolving credit facility | Jun. 30, 2014 Unsecured revolving credit facility | Jun. 30, 2013 Unsecured revolving credit facility | Aug. 04, 2014 Unsecured revolving credit facility Subsequent event | Jun. 30, 2014 Senior unsecured notes 4.30% | Jun. 30, 2014 Senior unsecured notes 6.75% | Jun. 30, 2014 Senior unsecured notes 6.75% maturing in 2021 | Jun. 30, 2014 Senior unsecured notes 5.625% due in 2042 | Jun. 30, 2014 Mortgages item property building | Jun. 30, 2014 Mortgages Significant Unobservable Inputs (Level 3) | Jun. 30, 2014 Capital leases property | Apr. 30, 2014 Senior unsecured notes due 2019 | Apr. 30, 2014 Senior unsecured notes due 2024 | May 30, 2014 Unsecured term loan | Jun. 30, 2014 Unsecured term loan
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of public issues of unsecured senior notes | 6 | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes | $ 1,742,893 | $ 1,742,893 |  | $ 1,093,337 |  |  |  |  |  | $ 250,000 | $ 200,000 | $ 300,000 | $ 350,000 |  |  |  | $ 400,000 | $ 250,000 |  |
Unsecured term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000
Aggregate principal amount of mortgage debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 655,324 |  |  |  |  |  |
Interest rate (as a percent) | 1.55% | 1.55% |  |  |  |  |  |  |  | 4.30% | 6.75% | 6.75% | 5.625% |  | 6.28% |  | 3.25% | 4.75% |  |
Number of buildings mortgaged |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |
Number of properties mortgaged |  |  |  |  |  |  |  |  |  |  |  |  |  | 47 |  |  |  |  |  |
Number of properties recorded under capital lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Carrying value of mortgaged properties | 5,258,671 | 5,258,671 |  | 4,422,865 |  |  |  |  |  |  |  |  |  | 886,458 |  | 18,403 |  |  |  |
Capital leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,047 |  |  |  |
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 |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity that may be increased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |
Interest rate, description |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  | LIBOR |
Interest rate added to the base rate (as a percent) |  |  |  |  |  |  | 1.30% |  |  |  |  |  |  |  |  |  |  |  | 1.40% |
Debt instrument, facility fee (as a percent) |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  | 1.42% | 2.56% | 1.42% | 1.86% |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.80% |  |  |  |  |  | 1.55%
Interest expense and other associated costs incurred |  |  |  |  | 969 |  | 1,880 |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, amount outstanding |  |  |  |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, available amount |  |  |  |  | 750,000 |  | 750,000 |  | 750,000 |  |  |  |  |  |  |  |  |  |  |
Sale of senior unsecured notes |  | 350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 | 250,000 |  |
Net proceeds after underwriting discounts from sale of senior unsecured notes | 644,889 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 644,889 |  |
Assumption of mortgage notes payable |  | 15,630 | 12,266 |  |  |  |  |  |  |  |  |  |  |  | 15,630 |  |  |  |  |
Fair value of mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,643 |  |  |  |  |
Increase (decrease) in outstanding principal balances |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,013 |  |  |  |  |
Number of mortgage notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Prepayment of mortgage notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,300 |  |  |  |  |  |

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