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Real Estate Properties - Intangible Lease Assets and Obligations - (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Real Estate [Line Items]
Acquired real rstate leases		$ 791,067	$ 775,935
Acquired real estate lease obligations		136,713	137,351
Accumulated amortization of capitalized below market lease values		40,695	31,312
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2018		55,898
2019		48,312
2020		39,921
2021		37,368
2022		34,809
Thereafter		$ 159,945
Weighted Average
Real Estate [Line Items]
Below market lease, remaining amortization period		10 years 8 months 18 days
Above market leases
Real Estate [Line Items]
Acquired real rstate leases		$ 40,540	43,906
Accumulated amortization		$ 29,900	28,739
Above market leases | Weighted Average
Real Estate [Line Items]
Finite-lived intangibles, remaining amortization period		4 years 7 months 6 days
In-place leases
Real Estate [Line Items]
Acquired real rstate leases		$ 750,527	732,029
Accumulated amortization		$ 288,902	$ 232,750
In-place leases | Weighted Average
Real Estate [Line Items]
Finite-lived intangibles, remaining amortization period		9 years 8 months 18 days
MOBs | Ohio
Real Estate [Line Items]
Acquired lease amortization period	14 years 1 month 6 days

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Represents the intangible lease liabilities recorded as part of the real estate acquisition.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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