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Fair Value of Assets and Liabilities - Liabilities (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Feb. 25, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Joint venture | Life Science Property |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Equity method investment ownership percentage |  | 55.00% |
Senior Unsecured Notes Due 2031 | Subsequent Event |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Principal amount of debt | $ 500 |  |
Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 3,299,762 | $ 2,518,410
Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 3,489,902 | 2,587,528
Senior unsecured notes, 6.750% coupon rate, due in 2020 | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon |  | 6.75% |
Secured and secured debt |  | $ 0 | 199,862
Senior unsecured notes, 6.750% coupon rate, due in 2020 | Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 0 | 200,306
Senior unsecured notes, 6.750% coupon rate, due in 2021 | Senior Unsecured Notes Due June 2021 | Subsequent Event |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon | 6.75% |  |
Debt extinguishment, amount | $ 200,000 |  |
Senior unsecured notes, 6.750% coupon rate, due in 2021 | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon |  | 6.75% |
Secured and secured debt |  | $ 299,273 | 298,486
Senior unsecured notes, 6.750% coupon rate, due in 2021 | Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 303,891 | 318,042
Senior unsecured notes, 4.750% coupon rate, due in 2024 | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon |  | 4.75% |
Secured and secured debt |  | $ 249,068 | 248,788
Senior unsecured notes, 4.750% coupon rate, due in 2024 | Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 256,258 | 260,683
Senior unsecured notes, 9.750% coupon rate, due in 2025 | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon |  | 9.75% |
Secured and secured debt |  | $ 984,359 | 0
Senior unsecured notes, 9.750% coupon rate, due in 2025 | Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 1,135,800 | 0
Senior unsecured notes, 4.750% coupon rate, due in 2028 | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon |  | 4.75% |
Secured and secured debt |  | $ 490,925 | 489,652
Senior unsecured notes, 4.750% coupon rate, due in 2028 | Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 502,648 | 506,155
Senior unsecured notes, 5.625% coupon rate, due in 2042 | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon |  | 5.625% |
Secured and secured debt |  | $ 341,802 | 341,421
Senior unsecured notes, 5.625% coupon rate, due in 2042 | Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 330,120 | 346,500
Senior unsecured notes, 6.250% coupon rate, due in 2046 | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon |  | 6.25% |
Secured and secured debt |  | $ 242,762 | 242,472
Senior unsecured notes, 6.250% coupon rate, due in 2046 | Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | 245,000 | 258,700
Senior unsecured notes 4.37 percent due 2031 | Senior Unsecured Notes Due 2031 | Subsequent Event |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Coupon | 4.375% |  |
Secured debts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Principal mortgage obligations |  | 3,015 |
Deb issuance costs |  | 25 |
Secured debts | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | 691,573 | 697,729
Secured debts | Estimated Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Secured and secured debt |  | $ 716,185 | $ 697,142

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