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Indebtedness (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Apr. 30, 2017 USD ($) property | Aug. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) property | May 31, 2017 USD ($) property | Apr. 30, 2017 USD ($) property | Sep. 30, 2017 USD ($) property building note | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) property building note | Sep. 30, 2016 USD ($) | Dec. 31, 2014 USD ($) | Nov. 08, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of public issues of unsecured senior notes | note |  |  |  |  |  |  | 6 |  | 6 |  |  |  |  |
Total real estate properties, gross |  |  |  |  |  |  | $ 7,837,448,000 |  | $ 7,837,448,000 |  |  |  | $ 7,730,523,000 |
Early repayment of senior debt, number of real estate properties collateralized by senior debt | property |  | 17 |  |  |  | 17 |  |  |  |  |  |  |  |
Repayments of first mortgage bond |  |  |  |  |  | $ 277,837,000 |  |  |  |  |  |  |  |
Early repayment of senior debt, unamortized premium |  | $ 5,449,000 |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of senior debt, debt instrument, interest rate, stated percentage |  | 6.71% |  |  |  | 6.71% |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  | 274,000 | $ 84,000 | 7,627,000 | $ 90,000 |  |  |  |
Line of credit facility, periodic payment, principal |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  | 471,000,000 |  | 471,000,000 |  |  |  | $ 327,000,000 |
Unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 149,000 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, interest rate payable (as a percent) |  |  |  |  |  |  | 2.40% |  | 2.40% |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  |  |  | 2.50% | 1.80% | 2.30% | 1.70% |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  | $ 471,000,000 |  | $ 471,000,000 |  |  |  |  |
Revolving credit facility, available amount |  |  |  |  |  |  | 529,000,000 |  | 529,000,000 |  |  |  |  |
Interest expense and other associated costs incurred |  |  |  |  |  |  | 3,512,000 | $ 2,024,000 | 8,538,000 | $ 9,159,000 |  |  |  |
Option to increase the borrowing capacity under revolving credit facility |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate added to the base rate (as a percent) | 1.30% |  | 1.20% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, facility fee (as a percent) | 0.30% |  | 0.25% |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |  |  | $ 485,000,000 |  |
Revolving credit facility, available amount |  |  |  |  |  |  |  |  |  |  |  | $ 515,000,000 |  |
Senior unsecured notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 3.25% |  | 3.25% |  |  |  |  |
Senior unsecured notes 6.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 6.75% |  | 6.75% |  |  |  |  |
Senior unsecured notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  | $ 300,000,000 |  | $ 300,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 6.75% |  | 6.75% |  |  |  |  |
Senior unsecured notes 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Senior unsecured notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 4.75% |  | 4.75% |  |  |  |  |
Senior unsecured notes 5.625% due in 2042 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.625% |  | 5.625% |  |  |  |  |
Senior unsecured notes 6.25% due in 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 6.25% |  | 6.25% |  |  |  |  |
Term loan due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 2.64% |  | 2.64% |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  |  |  | 2.60% | 1.90% | 2.40% | 1.90% |  |  |  |
Interest expense and other associated costs incurred |  |  |  |  |  |  | $ 2,363,000 | $ 1,707,000 | $ 6,419,000 | $ 4,956,000 |  |  |  |
Maximum borrowing capacity that may be increased |  |  |  |  |  |  | 700,000,000 |  | 700,000,000 |  |  |  |  |
Term loan due 2020 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate added to the base rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 1.40% |  |  |
Term loan due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 2.60% |  | 2.60% |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  |  |  | 2.70% | 2.30% | 2.70% | 2.30% |  |  |  |
Term loan due 2022 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate added to the base rate (as a percent) | 1.80% |  | 1.35% |  |  |  |  |  |  |  |  |  |  |
Term loan due 2022 | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000
Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of mortgage debt |  |  |  |  |  |  | $ 806,418,000 |  | $ 806,418,000 |  |  |  |  |
Number of properties mortgaged | property |  |  |  |  |  |  | 24 |  | 24 |  |  |  |  |
Number of buildings mortgaged | building |  |  |  |  |  |  | 25 |  | 25 |  |  |  |  |
Total real estate properties, gross |  |  |  |  |  |  | $ 1,232,275,000 |  | $ 1,232,275,000 |  |  |  |  |
Capital leases |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total real estate properties, gross |  |  |  |  |  |  | $ 36,234,000 |  | $ 36,234,000 |  |  |  |  |
Number of properties recorded under capital lease | property |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |
Capital leases |  |  |  |  |  |  | $ 10,892,000 |  | $ 10,892,000 |  |  |  |  |
Secured debt due August 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of senior debt, number of real estate properties collateralized by senior debt | property |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Repayments of first mortgage bond |  |  |  |  | $ 10,579,000 |  |  |  |  |  |  |  |  |
Early repayment of senior debt, debt instrument, interest rate, stated percentage |  |  |  |  | 6.15% |  |  |  |  |  |  |  |  |
Secured debt due August 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of senior debt, number of real estate properties collateralized by senior debt | property |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Repayments of first mortgage bond |  |  |  | $ 8,807,000 |  |  |  |  |  |  |  |  |  |
Early repayment of senior debt, debt instrument, interest rate, stated percentage |  |  |  | 5.95% |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | 7,353,000 |  |  |  |  |
Unsecured debt due September 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense and other associated costs incurred |  |  |  |  |  |  | 1,404,000 | $ 1,173,000 | 4,129,000 | $ 3,433,000 |  |  |  |
Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 125,000 |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity that may be increased |  |  |  |  |  |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  |  |

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- Definition Represents the maximum borrowing capacity to which loan may be expanded per the terms of the agreement, at the option of the reporting entity. + References No definition available. + Details
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- Definition Weighted average interest rate on debt during the period. + References No definition available. + Details
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- Definition Represents the interest expense and other associated costs related to debt instrument during the period. + References No definition available. + Details
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- Definition Represents the option to increase borrowings on the credit facility. + References No definition available. + Details
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- Definition The number of buildings serving as collateral for debt as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the number of public issues of unsecured senior notes. + References No definition available. + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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