XML 75 R56.htm IDEA: XBRL DOCUMENT v3.8.0.1

Indebtedness - Schedule of Outstanding Debts (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Face Amount	$ 1,750,000	$ 1,750,000
Unamortized Discount	$ 3,159	4,047
Senior unsecured notes due 2019
Debt Instrument [Line Items]
Coupon	3.25%
Face Amount	$ 400,000	400,000
Unamortized Discount	$ 78	138
Senior unsecured notes due 2020
Debt Instrument [Line Items]
Coupon	6.75%
Face Amount	$ 200,000	200,000
Unamortized Discount	$ 488	703
Unsecured senior notes due 2021
Debt Instrument [Line Items]
Coupon	6.75%
Face Amount	$ 300,000	300,000
Unamortized Discount	$ 2,093	2,627
Senior unsecured notes due 2024
Debt Instrument [Line Items]
Coupon	4.75%
Face Amount	$ 250,000	250,000
Unamortized Discount	$ 500	579
Senior unsecured notes due in 2042
Debt Instrument [Line Items]
Coupon	5.625%
Face Amount	$ 350,000	350,000
Unamortized Discount	$ 0	0
Senior unsecured notes due in 2046
Debt Instrument [Line Items]
Coupon	6.25%
Face Amount	$ 250,000	250,000
Unamortized Discount	$ 0	$ 0

X

- 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

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: 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

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=snh_SeniorUnsecuredNotes3.25PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=snh_SeniorUnsecuredNotes6.75PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=snh_SeniorUnsecuredNotes6.75PercentDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=snh_SeniorUnsecuredNotes4.75PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=snh_SeniorUnsecuredNotes5.625PercentDue2042Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=snh_SeniorUnsecuredNotes6.25DueIn2046Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: