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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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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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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Summary of Debt (Details)		9 Months Ended	12 Months Ended
Debt - Summary of Debt (Details)	Jul. 07, 2016	Sep. 30, 2020 USD ($) healthcareproperty	Dec. 31, 2019 USD ($) healthcareproperty
Debt
Long-term debt, gross		$ 1,378,504,000	$ 1,647,478,000
Unamortized deferred financing costs		(5,952,000)	(7,677,000)
Unamortized discounts		(5,015,000)	(5,483,000)
Unamortized fair value adjustments		88,000	135,000
Total debt		$ 1,367,625,000	1,634,453,000
2018 Credit Agreement Amendment \| London Interbank Offered Rate (LIBOR)
Debt
Reference rate (as a percent)		0.90%
Mortgages
Debt
Long-term debt, gross		$ 58,504,000	83,478,000
Mortgages \| Fixed interest rate mortgage notes
Debt
Long-term debt, gross		$ 52,280,000	$ 76,897,000
Weighted average interest rate		4.78%	4.43%
Pledged assets separately reported real estate pledged as collateral number \| healthcareproperty		4	5
Pledged assets, not separately reported, real estate		$ 111,300,000	$ 170,200,000
Mortgages \| Fixed interest rate mortgage notes \| Minimum
Debt
Interest rate (as a percent)		4.63%	3.00%
Mortgages \| Fixed interest rate mortgage notes \| Maximum
Debt
Interest rate (as a percent)		5.50%	5.50%
Mortgages \| Variable interest mortgage note
Debt
Long-term debt, gross		$ 6,224,000	$ 6,581,000
Weighted average interest rate		2.90%	4.50%
Pledged assets separately reported real estate pledged as collateral number \| healthcareproperty			1
Pledged assets, not separately reported, real estate		$ 8,500,000	$ 8,600,000
Mortgages \| Variable interest mortgage note \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt
Reference rate (as a percent)		2.75%
Revolving credit facility \| $850 million unsecured revolving credit facility bearing variable interest, due September 2022
Debt
Long-term debt, gross		$ 95,000,000	339,000,000
Debt instrument, face amount		$ 850,000,000
Reference rate (as a percent)		0.90%
Revolving credit facility \| $850 million unsecured revolving credit facility bearing variable interest, due September 2022 \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt
Reference rate (as a percent)		1.10%
Senior notes
Debt
Total debt		$ 975,000,000.0
Senior notes \| $400 million senior unsecured notes bearing fixed interest of 4.30%, due March 2027
Debt
Long-term debt, gross		400,000,000	400,000,000
Debt instrument, face amount		$ 400,000,000
Interest rate (as a percent)		4.30%
Senior notes \| $350 million senior unsecured notes bearing fixed interest of 3.95%, due January 2028
Debt
Long-term debt, gross		$ 350,000,000	350,000,000
Debt instrument, face amount		$ 350,000,000
Interest rate (as a percent)		3.95%
Senior notes \| $150 million senior unsecured notes bearing fixed interest of 4.03% to 4.74%, due January 2023 to 2031
Debt
Long-term debt, gross		$ 150,000,000	150,000,000
Debt instrument, face amount		$ 150,000,000
Senior notes \| $150 million senior unsecured notes bearing fixed interest of 4.03% to 4.74%, due January 2023 to 2031 \| Minimum
Debt
Interest rate (as a percent)		4.03%
Senior notes \| $150 million senior unsecured notes bearing fixed interest of 4.03% to 4.74%, due January 2023 to 2031 \| Maximum
Debt
Interest rate (as a percent)		4.74%
Senior notes \| $75 million senior unsecured notes bearing fixed interest of 4.09% to 4.24%, due August 2025 to 2027
Debt
Long-term debt, gross		$ 75,000,000	75,000,000
Debt instrument, face amount		$ 75,000,000
Senior notes \| $75 million senior unsecured notes bearing fixed interest of 4.09% to 4.24%, due August 2025 to 2027 \| Minimum
Debt
Interest rate (as a percent)		4.09%
Senior notes \| $75 million senior unsecured notes bearing fixed interest of 4.09% to 4.24%, due August 2025 to 2027 \| Maximum
Debt
Interest rate (as a percent)		4.24%
Unsecured Debt \| $250 million unsecured term borrowing bearing fixed interest, due June 2023
Debt
Long-term debt, gross		$ 250,000,000	$ 250,000,000
Debt instrument, face amount		$ 250,000,000
Unsecured Debt \| 2018 Credit Agreement Amendment \| London Interbank Offered Rate (LIBOR)
Debt
Reference rate (as a percent)	1.00%	1.00%	1.25%