Discontinued Operations and Dispositions of Real Estate - Quantitative Information about Fair Value Measurements in HCRMC (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discount rate	12.00%
HCRMC \| Level 3 \| Discounted cash flow valuation technique
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discount rate		15.20%
Minimum \| HCRMC \| Level 3 \| Discounted cash flow valuation technique
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of occupancy growth rates		(0.80%)
Range of earnings multiples		6.0
Maximum \| HCRMC \| Level 3 \| Discounted cash flow valuation technique
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of earnings multiples		7.0
HCRMC \| Minimum \| Level 3 \| Discounted cash flow valuation technique
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of revenue growth rate		(1.80%)
Range of operating expense growth rates		(1.10%)
HCRMC \| Maximum \| Level 3 \| Discounted cash flow valuation technique
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of revenue growth rate		3.00%
Range of occupancy growth rates		0.20%
Range of operating expense growth rates		3.10%
DFL Portfolio \| Senior housing \| HCRMC \| Minimum \| Income approach
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of EBITDAR		$ 75
Range of rent coverage ratio		1.05
Range of real estate capitalization rate		6.25%
DFL Portfolio \| Senior housing \| HCRMC \| Maximum \| Income approach
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of EBITDAR		$ 85
Range of rent coverage ratio		1.15
Range of real estate capitalization rate		7.25%
DFL Portfolio \| Post-acute/skilled \| HCRMC \| Income approach
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of EBITDAR		$ 435,000
DFL Portfolio \| Post-acute/skilled \| HCRMC \| Minimum \| Income approach
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of EBITDAR		$ 385
Range of rent coverage ratio		1.25
Range of real estate capitalization rate		7.50%
DFL Portfolio \| Post-acute/skilled \| HCRMC \| Maximum \| Income approach
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Range of rent coverage ratio		1.35
Range of real estate capitalization rate		8.50%

Real Estate Capitalized rate, , used as an input to measure fair value.

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Earnings before interest, taxes, depreciation, amortization and restructuring or rent costs (EBITDAR), used as an input to measure fair value.

+ References

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Rent coverage ratio, used as an input to measure fair value.

+ References

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Range of occupancy growth rate, as a percent.

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Range of operating expense growth rate, as a percent.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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Market valuation of entity divided by revenue, used as an input to measure fair value.

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