Represents the unamortized amount of debt fair value adjustments.

No definition available.

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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.

+ References

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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No definition available.

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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.

+ References

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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.

+ References

No definition available.

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- Definition

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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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

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- Definition

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)		9 Months Ended	12 Months Ended
Debt - Summary of Debt (Details)	Jul. 07, 2016 Rate	Sep. 30, 2017 USD ($) healthcareproperty Rate	Dec. 31, 2016 USD ($) properties Rate	Mar. 07, 2017 USD ($)	Jan. 26, 2017	Aug. 11, 2016 USD ($)	Jan. 07, 2016 USD ($)
Debt
Long-term debt, gross		$ 1,183,574,000	$ 999,194,000
Unamortized deferred financing costs		(7,917,000)	(8,477,000)
Unamortized discount		(3,715,000)	0
Unamortized fair value adjustment		275,000	438,000
Total principal		1,172,217,000	991,155,000
Mortgages
Debt
Long-term debt, gross		169,574,000	123,194,000
Senior notes
Debt
Effective fixed interest rate					4.30%
Debt instrument, face amount				$ 400,000,000.0		$ 75,000,000.0	$ 150,000,000.0
Mortgage notes, bearing fixed interest due in 2017, 2018, 2019, 2020, 2021, 2022, 2024, and 2032 \| Mortgages
Debt
Long-term debt, gross		$ 140,971,000	$ 90,185,000
Weighted average interest rate		4.41%	5.44%
Pledged assets, not separately reported, real estate		$ 216,900,000	$ 156,700,000
Pledged assets separately reported real estate pledged as collateral number		8	11
Mortgage notes, bearing fixed interest due in 2017, 2018, 2019, 2020, 2021, 2022, 2024, and 2032 \| Minimum \| Mortgages
Debt
Interest rate (as a percent) \| Rate		3.00%	4.71%
Mortgage notes, bearing fixed interest due in 2017, 2018, 2019, 2020, 2021, 2022, 2024, and 2032 \| Maximum \| Mortgages
Debt
Interest rate (as a percent) \| Rate		5.50%	6.58%
Mortgage Notes Bearing Variable Interest \| Mortgages
Debt
Long-term debt, gross		$ 28,603,000	$ 33,009,000
Revolving Credit Facility Due September 2020 \| $850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020
Debt
Long-term debt, gross		$ 139,000,000	401,000,000
Reference rate (as a percent)		1.20%
Debt instrument, face amount		$ 850,000,000
Senior Unsecured Note Due 2027 \| Senior notes
Debt
Long-term debt, gross		$ 400,000,000	0
Interest rate (as a percent)		4.30%
Debt instrument, face amount		$ 400,000,000
Unsecured Term Loan Due June 2023 \| $250 million unsecured term borrowing bearing fixed interest of 2.87%, due June 2023 (5)
Debt
Long-term debt, gross		$ 250,000,000	250,000,000
Interest rate (as a percent)		2.87%
Debt instrument, face amount		$ 250,000,000
Unsecured Notes Bearing Fixed Interest 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
Unsecured Notes Bearing Fixed Interest Due January 2023 to 2031 \| Minimum \| Senior notes
Debt
Interest rate (as a percent)		4.03%
Unsecured Notes Bearing Fixed Interest Due January 2023 to 2031 \| Maximum \| Senior notes
Debt
Interest rate (as a percent)		4.74%
Senior Unsecured Notes 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
Senior Unsecured Notes Due August 2025 to 2027 \| Minimum \| Senior notes
Debt
Interest rate (as a percent)		4.09%
Senior Unsecured Notes Due August 2025 to 2027 \| Maximum \| Senior notes
Debt
Interest rate (as a percent)		4.24%
Mortgage notes, bearing variable interest due in 2017 and 2018 \| Mortgages
Debt
Weighted average interest rate \| Rate		4.24%	3.68%
Pledged assets, not separately reported, real estate		$ 39,700,000	$ 45,600,000
Pledged assets separately reported real estate pledged as collateral number		3	4
London Interbank Offered Rate (LIBOR) \| Unsecured Term Loan Due June 2023 \| $250 million unsecured term borrowing bearing fixed interest of 2.87%, due June 2023 (5)
Debt
Reference rate (as a percent)	1.80%	1.80%
London Interbank Offered Rate (LIBOR) \| Mortgage notes, bearing variable interest due in 2017 and 2018 \| Minimum \| Mortgages
Debt
Reference rate (as a percent) \| Rate		2.25%	2.25%
London Interbank Offered Rate (LIBOR) \| Mortgage notes, bearing variable interest due in 2017 and 2018 \| Maximum \| Mortgages
Debt
Reference rate (as a percent)		3.25%	3.25%
Interest Rate Swap
Debt
Effective fixed interest rate \| Rate	2.87%
Interest Rate Swap \| London Interbank Offered Rate (LIBOR) \| $250 million unsecured term borrowing bearing fixed interest of 2.87%, due June 2023 (5)
Debt
Interest rate (as a percent) \| Rate	2.87%
Effective fixed interest rate \| Rate	1.07%