Debt - Summary of Debt (Details)	6 Months Ended
Jun. 30, 2019 USD ($) healthcareproperty	Dec. 31, 2018 USD ($)
Debt
Long-term debt, gross	$ 1,543,349,000	$ 1,548,662,000
Unamortized deferred financing costs	(8,767,000)	(9,920,000)
Unamortized discounts	(5,788,000)	(6,086,000)
Unamortized fair value adjustments	167,000	197,000
Total debt	$ 1,528,961,000	1,532,853,000
2018 Credit Agreement Amendment \| London Interbank Offered Rate (LIBOR)
Debt
Reference rate (as a percent)	1.10%
Mortgages
Debt
Long-term debt, gross	$ 99,349,000	108,662,000
Mortgages \| Fixed interest rate mortgage notes
Debt
Long-term debt, gross	$ 92,621,000	$ 101,832,000
Weighted average interest rate	4.37%	4.26%
Pledged assets separately reported real estate pledged as collateral number \| healthcareproperty	5
Pledged assets, not separately reported, real estate	$ 172,200,000	$ 174,200,000
Mortgages \| Fixed interest rate mortgage notes \| Minimum
Debt
Interest rate (as a percent)	3.00%
Mortgages \| Fixed interest rate mortgage notes \| Maximum
Debt
Interest rate (as a percent)	5.50%
Mortgages \| Variable interest mortgage note
Debt
Long-term debt, gross	$ 6,728,000	$ 6,830,000
Weighted average interest rate	5.15%	5.21%
Pledged assets separately reported real estate pledged as collateral number \| healthcareproperty	1
Pledged assets, not separately reported, real estate	$ 8,600,000	$ 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 of LIBOR plus 1.10%, due September 2022
Debt
Long-term debt, gross	$ 219,000,000	215,000,000
Debt instrument, face amount	$ 850,000,000
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 \| $850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.10%, due September 2022 \| London Interbank Offered Rate (LIBOR)
Debt
Reference rate (as a percent)	1.10%
Unsecured Debt \| $250 million unsecured term borrowing bearing fixed interest of 2.32%, due June 2023
Debt
Long-term debt, gross	$ 250,000,000	$ 250,000,000
Debt instrument, face amount	$ 250,000,000
Interest rate (as a percent)	2.32%
Unsecured Debt \| $250 million unsecured term borrowing bearing fixed interest of 2.32%, due June 2023 \| London Interbank Offered Rate (LIBOR)
Debt
Reference rate (as a percent)	1.25%
Unsecured Debt \| 2018 Credit Agreement Amendment \| London Interbank Offered Rate (LIBOR)
Debt
Reference rate (as a percent)	1.25%

Represents the unamortized amount of debt fair value adjustments.

No definition available.

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- Definition

The number of properties, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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No definition available.

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- Definition

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

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- Definition

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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- Definition

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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- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

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The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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