Capital Expenditure Funding Capacity

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Debt Instrument, Outstanding Percentage, Maximum

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Debt Instrument, Redemption Percentage, Maximum

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Weighted average interest rate on debt during the period.

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Extinguishment Of Debt, Accrued And Interest Payable

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Minimum Liquidity Requirement Amount

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Represents the number of communities.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Increase for accrued, but unpaid interest on the debt instrument for the period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Weighted average interest rate of debt outstanding.

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Gross amount of debt extinguished.

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No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The number of real estate properties owned as of the balance sheet date.

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No definition available.

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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Indebtedness - Narrative (Details)	1 Months Ended										5 Months Ended	12 Months Ended
Indebtedness - Narrative (Details)	Feb. 25, 2021 USD ($)	Jan. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	May 31, 2020 USD ($) property	Apr. 30, 2020 USD ($)	Feb. 29, 2020 USD ($) property	May 31, 2019 USD ($) community	Jun. 30, 2018 USD ($) property	Mar. 31, 2018 USD ($) property	Feb. 28, 2018 USD ($) property	Jun. 02, 2020	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($)	Feb. 22, 2021 USD ($)	Jan. 30, 2021 USD ($)	Sep. 30, 2018 USD ($) property	Jul. 31, 2018 USD ($) property	Jan. 31, 2018 USD ($) property
Debt Instrument
Unsecured revolving credit facility												$ 0	$ 537,500,000
Revolving credit facility, available amount												$ 1,000,000,000
Number of properties owned (property) \| property												397
Total real estate properties, gross												$ 7,410,730,000	7,461,586,000
Mortgage debt assumed												0	0	$ 44,386,000
Loss on early extinguishment of debt												427,000	44,000	$ 22,000
Senior unsecured notes
Debt Instrument
Principal amount of debt												$ 2,650,000,000	$ 1,850,000,000
Senior Living Communities
Debt Instrument
Number of properties owned (property) \| property												28	25
Medical Office
Debt Instrument
Number of properties owned (property) \| property												7	20
Life Science
Debt Instrument
Number of properties owned (property) \| property													1
Unsecured Revolving Credit Facility
Debt Instrument
Unsecured revolving credit facility, maximum borrowing capacity												$ 800,000,000
Revolving credit facility, interest rate payable (as a percent)												2.60%
Loan commitment fee percentage												0.30%
Weighted average annual interest rate (as a percent)													2.90%
Unsecured revolving credit facility												$ 0
Weighted average interest rate on debt (as a percent)												2.20%	3.40%	3.00%
Unsecured Revolving Credit Facility \| Medical Office and Life Science
Debt Instrument
Number of properties owned (property) \| property												91
Total real estate properties, gross												$ 1,429,612,000
Senior unsecured notes due 2019
Debt Instrument
Interest rate (as a percent)							325.00%
Loss on early extinguishment of debt													$ 17,000
Debt extinguishment, amount							$ 400,000
Debt extinguishment, accrued and interest payable							6,500,000
Senior Unsecured Note Due July 2019
Debt Instrument
Principal amount of debt							$ 42,211,000
Interest rate (as a percent)							3.79%
Number of communities \| community							4
Unsecured Notes Due June 2023
Debt Instrument
Interest rate (as a percent)										6.64%
Mortgage debt assumed										$ 16,748,000
Unsecured Notes Due June 2023 \| Senior Living Communities
Debt Instrument
Number of properties owned (property) \| property										1
Unsecured Notes Due July 2043
Debt Instrument
Interest rate (as a percent)									4.44%
Mortgage debt assumed									$ 11,050,000
Unsecured Notes Due July 2043 \| Medical Office
Debt Instrument
Number of properties owned (property) \| property									1
Senior Notes Due October 2022
Debt Instrument
Interest rate (as a percent)								5.75%
Mortgage debt assumed								$ 16,588,000
Senior Notes Due October 2022 \| Senior Living Communities
Debt Instrument
Number of properties owned (property) \| property								2
Term loan due 2020
Debt Instrument
Weighted average annual interest rate (as a percent)											2.40%
Principal amount of debt			$ 250,000										250,000,000
Loss on early extinguishment of debt												26,000	(27,000)
Unsecured term loan due January 2020
Debt Instrument
Principal amount of debt													$ 350,000,000
Term loan due 2022
Debt Instrument
Principal amount of debt												$ 200,000,000
Interest rate (as a percent)												2.80%
Weighted average interest rate on debt (as a percent)												2.70%	3.70%	3.40%
Mortgage maturing in September 2043
Debt Instrument
Interest rate (as a percent)																			4.40%
Number of properties owned (property) \| property																			1
Secured debt																			$ 4,338,000
Senior Unsecured Notes Due October 2018
Debt Instrument
Principal amount of debt																		$ 90,602,000
Number of properties owned (property) \| property																		12
Weighted average interest rate on debt (as a percent)																		5.00%
Senior Unsecured Notes Due January 2019
Debt Instrument
Principal amount of debt																	$ 6,325,000
Interest rate (as a percent)																	4.70%
Number of properties owned (property) \| property																	1
Loss on early extinguishment of debt														$ 22,000
Senior Unsecured Notes Due March 2026 \| Life Science
Debt Instrument
Interest rate (as a percent)						6.25%
Number of properties owned (property) \| property						1
Loss on early extinguishment of debt												$ 246,000
Repayments of debt						$ 1,554,000
Senior unsecured note due 2020
Debt Instrument
Interest rate (as a percent)					6.75%
Debt extinguishment, amount					$ 200,000
Accrued and unpaid interest					$ 6,750,000
Mortgage notes 7.49% maturing in January 2022 \| Medical Office
Debt Instrument
Interest rate (as a percent)				7.49%
Number of properties owned (property) \| property				1
Loss on early extinguishment of debt												$ 155,000
Repayments of debt				$ 1,213,000
Senior Unsecured Note Due March 2025
Debt Instrument
Principal amount of debt			$ 1,000,000
Interest rate (as a percent)			9.75%
Net proceeds from offering			$ 982,300,000
Debt instrument, redemption percentage, maximum			40.00%
Debt instrument, outstanding percentage, maximum			50.00%
Subsequent Event \| Unsecured Revolving Credit Facility
Debt Instrument
Unsecured revolving credit facility, maximum borrowing capacity		$ 800,000,000														$ 1,000,000,000
Unsecured revolving credit facility															$ 0
Revolving credit facility, available amount															$ 800,000,000
Capital expenditure funding capacity		250,000,000
Minimum liquidity requirement amount		$ 200,000,000
Subsequent Event \| Senior Unsecured Notes Due June 2021 \| Senior unsecured notes
Debt Instrument
Principal amount of debt	$ 200,000,000
Interest rate (as a percent)	6.75%
Subsequent Event \| Senior Unsecured Note Due 2031
Debt Instrument
Interest rate (as a percent)	4.375%
Subsequent Event \| Senior Unsecured Notes Due 2031
Debt Instrument
Principal amount of debt	$ 500,000
Subsequent Event \| Senior Unsecured Notes Due 2031 \| Senior unsecured notes
Debt Instrument
Principal amount of debt	$ 500,000,000
Interest rate (as a percent)	4.375%
Net proceeds from offering	$ 491,100,000
Subsequent Event \| Revolving Credit Facility \| Unsecured Revolving Credit Facility \| LIBOR
Debt Instrument
Basis points per annum (as a percent)		0.30%
Subsequent Event \| Forecast \| Unsecured Revolving Credit Facility
Debt Instrument
Capital expenditure funding capacity	$ 350,000,000