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Related Person Transactions - Due from/to Related Parties (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Due from related parties	$ 188,251	$ 32,712
Managed REITs
Related Party Transaction [Line Items]
Due from related parties	185,748	31,238
GOV
Related Party Transaction [Line Items]
Due from related parties	7,094	6,369
HPT
Related Party Transaction [Line Items]
Due from related parties	82,256	7,968
SIR
Related Party Transaction [Line Items]
Due from related parties	32,140	7,351
SNH
Related Party Transaction [Line Items]
Due from related parties	64,258	9,550
Managed Operators
Related Party Transaction [Line Items]
Due from related parties	966	750
Five Star
Related Party Transaction [Line Items]
Due from related parties	393	305
Sonesta
Related Party Transaction [Line Items]
Due from related parties	0	1
TA
Related Party Transaction [Line Items]
Due from related parties	573	444
Other
Related Party Transaction [Line Items]
Due from related parties	1,537	724
AIC
Related Party Transaction [Line Items]
Due from related parties	20	22
RIF
Related Party Transaction [Line Items]
Due from related parties	35	36
ABP Trust
Related Party Transaction [Line Items]
Due from related parties	498	551
TRMT
Related Party Transaction [Line Items]
Due from related parties	$ 984	$ 115

X

- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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 210.7-03.3)
-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 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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+ References

No definition available.

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