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Fair Value of Assets and Liabilities - Liabilities (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Life Science Property | Joint Venture |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Ownership percentage | 55.00% |
Senior Unsecured Notes | Senior unsecured notes, 6.750% coupon rate, due in 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Coupon rate (percent) | 6.75% |
Debt face amount | $ 300,000,000 |
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | $ 3,792,051,000 | $ 3,299,762,000
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 6.750% coupon rate, due in 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Coupon rate (percent) | 6.75% |
Fair value disclosure | $ 299,470,000 | 299,273,000
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 4.750% coupon rate, due in 2024 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Coupon rate (percent) | 4.75% |
Fair value disclosure | $ 249,138,000 | 249,068,000
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 9.750% coupon rate, due in 2025 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Coupon rate (percent) | 9.75% |
Fair value disclosure | $ 985,245,000 | 984,359,000
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 4.750% coupon rate, due in 2028 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Coupon rate (percent) | 4.75% |
Fair value disclosure | $ 491,244,000 | 490,925,000
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 4.375% coupon rate, due in 2031 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Coupon rate (percent) | 4.375% |
Fair value disclosure | $ 491,490,000 | 0
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 5.625% coupon rate, due in 2042 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Coupon rate (percent) | 5.625% |
Fair value disclosure | $ 341,897,000 | 341,802,000
Carrying Amount | Senior Unsecured Notes | Senior unsecured notes, 6.250% coupon rate, due in 2046 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Coupon rate (percent) | 6.25% |
Fair value disclosure | $ 242,834,000 | 242,762,000
Carrying Amount | Secured debts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 690,733,000 | 691,573,000
Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 3,944,284,000 | 3,489,902,000
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 6.750% coupon rate, due in 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 302,631,000 | 303,891,000
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 4.750% coupon rate, due in 2024 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 258,289,000 | 256,258,000
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 9.750% coupon rate, due in 2025 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 1,130,760,000 | 1,135,800,000
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 4.750% coupon rate, due in 2028 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 493,445,000 | 502,648,000
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 4.375% coupon rate, due in 2031 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 487,870,000 | 0
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 5.625% coupon rate, due in 2042 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 323,400,000 | 330,120,000
Estimated Fair Value | Senior Unsecured Notes | Senior unsecured notes, 6.250% coupon rate, due in 2046 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | 243,600,000 | 245,000,000
Estimated Fair Value | Secured debts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value disclosure | $ 704,289,000 | $ 716,185,000

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