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Relationships with Managers - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) hotel	Dec. 31, 2016 USD ($) hotel	Dec. 31, 2015 USD ($) hotel
Real Estate Properties [Line Items]
Number of hotels that earned incentive management fees | hotel		10	9	7
Amortization		$ 5,760	$ 2,851	$ 993
Number of franchised hotels | hotel		13
Key Money
Real Estate Properties [Line Items]
Amortization		$ 5,800	$ 2,900	1,000
Key Money | The Gwen Chicago
Real Estate Properties [Line Items]
Amortization				$ 3,000
Key Money | Courtyard Manhattan / Midtown East
Real Estate Properties [Line Items]
Amortization		1,900
Key Money | Frenchman's Reef & Morning Star Marriott Beach
Real Estate Properties [Line Items]
Amortization		$ 2,600
Key Money | Frenchman's Reef & Morning Star Marriott Beach | Scenario, Forecast
Real Estate Properties [Line Items]
Amortization	$ 2,200

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Number Of Franchised Hotels

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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