Represents the unamortized amount of debt fair value adjustments.

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

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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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- 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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Fixed interest rate related to the interest rate derivative.

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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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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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Debt - Summary of Debt (Details)	12 Months Ended
Debt - Summary of Debt (Details)	Dec. 31, 2018 USD ($) healthcareproperty	Dec. 31, 2017 USD ($) properties	Dec. 01, 2017 USD ($)	Mar. 07, 2017 USD ($)	Aug. 11, 2016 USD ($)	Jul. 07, 2016	Jan. 07, 2016 USD ($)
Debt
Debt, gross	$ 1,548,662,000	$ 1,491,680,000
Unamortized deferred financing costs	(9,920,000)	(7,808,000)
Unamortized discounts	(6,086,000)	(6,663,000)
Unamortized fair value adjustments	197,000	259,000
Total debt	1,532,853,000	1,477,468,000
Mortgages
Debt
Debt, gross	$ 108,662,000	$ 186,680,000
Senior Notes
Debt
Total mortgage debt			$ 350,000,000.0	$ 400,000,000.0	$ 75,000,000.0		$ 150,000,000.0
Fixed interest rate			3.95%	4.30%
Interest Rate Swaps \| Unsecured Debt \| LIBOR
Debt
Effective fixed interest rate	2.32%	2.87%
Fixed interest rate	1.07%					1.07%
Mortgage Notes Bearing Fixed Interest Rate Due In 2020, 2021, 2022, and 2024 \| Mortgages
Debt
Debt, gross	$ 101,832,000
Weighted average interest rate (as a percent)	4.26%
Number of properties included in collateralized \| healthcareproperty	5
Net book value of properties included in the collateralized	$ 174,200,000
Mortgage Notes Bearing Fixed Interest Rate Due In 2020, 2021, 2022, and 2024 \| Mortgages \| Minimum
Debt
Effective fixed interest rate	3.00%
Mortgage Notes Bearing Fixed Interest Rate Due In 2020, 2021, 2022, and 2024 \| Mortgages \| Maximum
Debt
Effective fixed interest rate	5.50%
Mortgage Notes Bearing Fixed Interest Rate Due In 2018, 2019, 2020, 2021, 2022, and 2024 [Member] \| Mortgages
Debt
Debt, gross		$ 158,171,000
Weighted average interest rate (as a percent)		4.45%
Number of properties included in collateralized \| properties		9
Net book value of properties included in the collateralized		$ 267,700,000
Mortgage Notes Bearing Fixed Interest Rate Due In 2018, 2019, 2020, 2021, 2022, and 2024 [Member] \| Mortgages \| Minimum
Debt
Effective fixed interest rate		3.00%
Mortgage Notes Bearing Fixed Interest Rate Due In 2018, 2019, 2020, 2021, 2022, and 2024 [Member] \| Mortgages \| Maximum
Debt
Effective fixed interest rate		5.50%
Mortgage Notes Bearing Variable Interest Due In 2018 And 2022 \| Mortgages
Debt
Debt, gross	$ 6,830,000
Weighted average interest rate (as a percent)	5.21%
Number of properties included in collateralized \| healthcareproperty	1
Net book value of properties included in the collateralized	$ 8,600,000
Mortgage Notes Bearing Variable Interest Due In 2018 And 2022 \| Mortgages \| Minimum \| LIBOR
Debt
Reference rate (as a percent)	2.75%
Mortgage Notes Bearing Variable Interest Due 2018 \| Mortgages
Debt
Debt, gross		$ 28,509,000
Weighted average interest rate (as a percent)		4.50%
Number of properties included in collateralized \| properties		3
Net book value of properties included in the collateralized		$ 39,200,000
Mortgage Notes Bearing Variable Interest Due 2018 \| Mortgages \| Minimum \| LIBOR
Debt
Reference rate (as a percent)		2.25%
Mortgage Notes Bearing Variable Interest Due 2018 \| Mortgages \| Maximum \| LIBOR
Debt
Reference rate (as a percent)		3.25%
Revolving Credit Facility Due September 2020 \| Credit Agreement
Debt
Debt, gross	$ 215,000,000	$ 80,000,000
Reference rate (as a percent)		1.20%
Total mortgage debt	$ 850,000,000
Revolving Credit Facility Due September 2020 \| Credit Agreement \| LIBOR
Debt
Reference rate (as a percent)	1.10%
Unsecured Notes Bearing Fixed Interest Due March 2027 \| Senior Notes
Debt
Debt, gross	$ 400,000,000	$ 400,000,000
Effective fixed interest rate	4.30%
Total mortgage debt	$ 400,000,000
Unsecured Notes Bearing Fixed Interest Due January 2028 \| Senior Notes
Debt
Debt, gross	$ 350,000,000	350,000,000
Effective fixed interest rate	3.95%
Total mortgage debt	$ 350,000,000
Unsecured Term Loan Due June 2023 \| Unsecured Debt
Debt
Debt, gross	$ 250,000,000	$ 250,000,000
Effective fixed interest rate	2.32%	2.87%
Total mortgage debt	$ 250,000,000
Unsecured Term Loan Due June 2023 \| Unsecured Debt \| LIBOR
Debt
Reference rate (as a percent)	1.25%
Unsecured Notes Bearing Fixed Interest Due January 2023 to 2031 \| Senior Notes
Debt
Debt, gross	$ 150,000,000	$ 150,000,000
Total mortgage debt	$ 150,000,000
Unsecured Notes Bearing Fixed Interest Due January 2023 to 2031 \| Senior Notes \| Minimum
Debt
Effective fixed interest rate	4.03%
Unsecured Notes Bearing Fixed Interest Due January 2023 to 2031 \| Senior Notes \| Maximum
Debt
Effective fixed interest rate	4.74%
Senior Unsecured Notes Due August 2025 to 2027 \| Senior Notes
Debt
Debt, gross	$ 75,000,000	$ 75,000,000
Total mortgage debt	$ 75,000,000
Senior Unsecured Notes Due August 2025 to 2027 \| Senior Notes \| Minimum
Debt
Effective fixed interest rate	4.09%
Senior Unsecured Notes Due August 2025 to 2027 \| Senior Notes \| Maximum
Debt
Effective fixed interest rate	4.24%