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Indebtedness (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 USD ($) loan building property | Apr. 30, 2016 USD ($) property | Feb. 29, 2016 USD ($) | Jan. 31, 2016 USD ($) property | Sep. 30, 2015 | Jun. 30, 2016 USD ($) property building item | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) property building item | Jun. 30, 2015 USD ($) | Aug. 04, 2016 USD ($) | Dec. 31, 2015 USD ($)
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Number of public issues of unsecured senior notes | item |  |  |  |  |  | 6 |  | 6 |  |  |
Principal amount of unsecured senior notes |  |  |  |  |  | $ 1,721,306,000 |  | $ 1,721,306,000 |  |  | $ 1,478,536,000
Aggregate principal amount of mortgage debt |  |  |  |  |  | 636,087,000 |  | 636,087,000 |  |  |
Carrying value of mortgaged properties |  |  |  |  |  | 6,418,923,000 |  | 6,418,923,000 |  |  | 6,309,400,000
Unsecured revolving credit facility |  |  |  |  |  | 749,000,000 |  | 749,000,000 |  |  | $ 775,000,000
Loss on early extinguishment of debt |  |  |  |  |  |  | $ (39,000) | (6,000) | $ (1,448,000) |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  |  |  |  | 1,000,000,000 |  | 1,000,000,000 |  |  |
Option to increase the borrowing capacity under revolving credit facility |  |  |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  |  |
Revolving credit facility, interest rate payable (as a percent) |  |  |  |  |  | 1.70% |  | 1.70% |  |  |
Interest expense and other associated costs incurred |  |  |  |  |  | $ 3,454,000 | $ 2,063,000 | $ 7,136,000 | $ 3,003,000 |  |
Unsecured revolving credit facility |  |  |  |  |  | $ 749,000,000 |  | $ 749,000,000 |  | $ 100,000,000 |
Weighted average interest rate on debt (as a percent) |  |  |  |  |  | 1.70% | 1.50% | 1.70% | 1.50% |  |
Revolving credit facility, available amount |  |  |  |  |  | $ 251,000,000 |  | $ 251,000,000 |  | $ 900,000,000 |
Unsecured revolving credit facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Interest rate added to the base rate (as a percent) |  |  |  |  |  |  |  | 130.00% |  |  |
Debt instrument, facility fee (as a percent) |  |  |  |  |  |  |  | 30.00% |  |  |
Senior unsecured notes due 2019 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes |  |  |  |  |  | $ 400,000,000 |  | $ 400,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  | 3.25% |  | 3.25% |  |  |
Senior unsecured notes 6.75% |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes |  |  |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  | 6.75% |  | 6.75% |  |  |
Unsecured senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes |  |  |  |  |  | $ 300,000,000 |  | $ 300,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  | 6.75% |  | 6.75% |  |  |
Senior unsecured notes due 2024 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes |  |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  | 4.75% |  | 4.75% |  |  |
Senior unsecured notes 5.625% due in 2042 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes |  |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.625% |  | 5.625% |  |  |
Senior unsecured notes 6.25% due in 2046 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes |  |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |
Interest rate (as a percent) |  |  | 6.25% |  |  | 6.25% |  | 6.25% |  |  |
Sale of senior unsecured notes |  |  | $ 250,000,000 |  |  |  |  |  |  |  |
Net proceeds after underwriting discounts from sale of senior unsecured notes |  |  | $ 241,350,000 |  |  |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Number of properties mortgaged | property | 1 | 1 |  | 1 |  | 54 |  | 54 |  |  |
Number of buildings mortgaged | building |  |  |  |  |  | 55 |  | 55 |  |  |
Carrying value of mortgaged properties |  |  |  |  |  | $ 1,040,792,000 |  | $ 1,040,792,000 |  |  |
Weighted average interest rate on prepaid debt (as a percent) | 6.25% | 4.65% |  | 5.97% |  |  |  |  |  |  |
Prepayment of mortgage | $ 11,871,000 | $ 18,000,000 |  | $ 6,115,000 |  |  |  |  |  |  |
Capital leases |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Carrying value of mortgaged properties |  |  |  |  |  | $ 36,039,000 |  | $ 36,039,000 |  |  |
Number of properties recorded under capital lease | property |  |  |  |  |  | 2 |  | 2 |  |  |
Capital leases |  |  |  |  |  | $ 11,817,000 |  | $ 11,817,000 |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  |  | 2.30% |  | 2.30% |  |  |
Unsecured Debt | LIBOR |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Interest rate added to the base rate (as a percent) |  |  |  |  | 180.00% |  |  | 140.00% |  |  |
Term Loan Due 2020 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 1.90% |  | 1.90% |  |  |
Unsecured term loan facility |  |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  |
Interest expense and other associated costs incurred |  |  |  |  |  | $ 1,635,000 | $ 1,449,000 | $ 3,249,000 | $ 2,823,000 |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  |  | 1.90% | 1.60% | 1.90% | 1.60% |  |
Maximum borrowing capacity that may be increased |  |  |  |  |  | $ 700,000,000 |  | $ 700,000,000 |  |  |
Term Loan Due 2022 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes |  |  |  |  |  | 200,000,000 |  | 200,000,000 |  |  |
Unsecured term loan facility |  |  |  |  |  | 200,000,000 |  | $ 200,000,000 |  |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  |  |  |  | 2.30% |  |  |
Maximum borrowing capacity that may be increased |  |  |  |  |  | 400,000,000 |  | $ 400,000,000 |  |  |
Unsecured Debt September 2015 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Interest expense and other associated costs incurred |  |  |  |  |  | $ 1,133,000 |  | $ 2,260,000 |  |  |
Prepayment Notification | Mortgages |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Number of properties mortgaged | loan | 2 |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on prepaid debt (as a percent) | 5.92% |  |  |  |  |  |  |  |  |  |
Number of mortgage notes | loan | 2 |  |  |  |  |  |  |  |  |  |
Prepayment of mortgage | $ 79,957,000 |  |  |  |  |  |  |  |  |  |
MOBs | Secured debt financing due 2026 |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of mortgage debt | $ 620,000,000 |  |  |  |  |  |  |  |  |  |
Number of properties mortgaged | property | 1 |  |  |  |  |  |  |  |  |  |
Number of buildings mortgaged | building | 2 |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on debt (as a percent) | 3.53% |  |  |  |  |  |  |  |  |  |

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