Debt - Summary of Debt (Details)	3 Months Ended
Mar. 31, 2019 USD ($) healthcareproperty	Dec. 31, 2018 USD ($)
Debt
Long-term debt, gross	$ 1,560,754,000	$ 1,548,662,000
Unamortized deferred financing costs	(9,336,000)	(9,920,000)
Unamortized discounts	(5,939,000)	(6,086,000)
Unamortized fair value adjustments	182,000	197,000
Total debt	1,545,661,000	1,532,853,000
Mortgages
Debt
Long-term debt, gross	99,754,000	108,662,000
Senior notes
Debt
Total debt	975,000,000.0
Mortgage notes bearing fixed interest rate due in 2019, 2020, 2021, 2022, and 2024 \| Mortgages
Debt
Long-term debt, gross	$ 92,975,000	$ 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	$ 173,000,000.0	$ 174,200,000
Mortgage notes bearing fixed interest rate due in 2019, 2020, 2021, 2022, and 2024 \| Minimum \| Mortgages
Debt
Interest rate (as a percent)	3.00%
Mortgage notes bearing fixed interest rate due in 2019, 2020, 2021, 2022, and 2024 \| Maximum \| Mortgages
Debt
Interest rate (as a percent)	5.50%
Mortgage Notes Bearing Variable Interest Due 2028 \| Mortgages
Debt
Long-term debt, gross	$ 6,779,000	$ 6,830,000
Weighted average interest rate	5.24%	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
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.10%, due September 2022 \| $850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.10%, due September 2022
Debt
Long-term debt, gross	236,000,000	215,000,000
Debt instrument, face amount	$ 850,000,000
Reference rate (as a percent)	1.10%
$400 million senior unsecured notes bearing fixed interest of 4.30%, due March 2027 \| Senior notes
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%
$350 million senior unsecured notes bearing fixed interest of 3.95%, due January 2028 \| Senior notes
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%
$250 million unsecured term borrowing bearing fixed interest of 2.32%, due June 2023 \| $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%
$150 million senior unsecured notes bearing fixed interest of 4.03% to 4.74%, due January 2023 to 2031 \| Senior notes
Debt
Long-term debt, gross	$ 150,000,000	150,000,000
Debt instrument, face amount	$ 150,000,000
$150 million senior unsecured notes bearing fixed interest of 4.03% to 4.74%, due January 2023 to 2031 \| Minimum \| Senior notes
Debt
Interest rate (as a percent)	4.03%
$150 million senior unsecured notes bearing fixed interest of 4.03% to 4.74%, due January 2023 to 2031 \| Maximum \| Senior notes
Debt
Interest rate (as a percent)	4.74%
$75 million senior unsecured notes bearing fixed interest of 4.09% to 4.24%, due August 2025 to 2027 \| Senior notes
Debt
Long-term debt, gross	$ 75,000,000	$ 75,000,000
Debt instrument, face amount	$ 75,000,000
$75 million senior unsecured notes bearing fixed interest of 4.09% to 4.24%, due August 2025 to 2027 \| Minimum \| Senior notes
Debt
Interest rate (as a percent)	4.09%
$75 million senior unsecured notes bearing fixed interest of 4.09% to 4.24%, due August 2025 to 2027 \| Maximum \| Senior notes
Debt
Interest rate (as a percent)	4.24%
London Interbank Offered Rate (LIBOR) \| Mortgage Notes Bearing Variable Interest Due 2028 \| Maximum \| Mortgages
Debt
Reference rate (as a percent)	2.75%
London Interbank Offered Rate (LIBOR) \| $850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.10%, due September 2022 \| $250 million unsecured term borrowing bearing fixed interest of 2.32%, due June 2023
Debt
Reference rate (as a percent)	1.10%
London Interbank Offered Rate (LIBOR) \| $250 million unsecured term borrowing bearing fixed interest of 2.32%, due June 2023 \| $250 million unsecured term borrowing bearing fixed interest of 2.32%, due June 2023
Debt
Reference rate (as a percent)	1.25%
London Interbank Offered Rate (LIBOR) \| 2018 Credit Agreement Amendment
Debt
Reference rate (as a percent)	1.10%
London Interbank Offered Rate (LIBOR) \| 2018 Credit Agreement Amendment \| $250 million unsecured term borrowing bearing fixed interest of 2.32%, due June 2023
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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- Definition

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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- Definition

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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- Definition

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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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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