Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Fair value measurements
Mortgage loans receivable	$ 233,383	$ 223,907
Senior unsecured notes, net of debt issue costs	566,888	571,002
Accrued incentives and earn-outs	$ 9,041	$ 8,916
Level 3 \| Senior Unsecured Notes maturing before 2026
Fair value measurements
Discount rate (as a percent)	4.50%	4.10%
Level 3 \| Senior Unsecured Notes maturing 2026 and after
Fair value measurements
Discount rate (as a percent)	4.75%	4.30%
Level 3 \| Accrued incentives and earn-out liabilities
Fair value measurements
Discount rate (as a percent)	6.70%	6.20%
Level 3 \| Mortgage Loans Receivable
Fair value measurements
Discount rate (as a percent)	8.20%	8.70%
Carrying Value
Fair value measurements
Mortgage loans receivable	$ 233,383	$ 223,907
Bank borrowings	120,500	96,500
Senior unsecured notes, net of debt issue costs	566,888	571,002
Accrued incentives and earn-outs	9,041	8,916
Fair Value
Fair value measurements
Bank borrowings	120,500	96,500
Fair Value \| Level 3
Fair value measurements
Mortgage loans receivable	302,671	278,224
Senior unsecured notes, net of debt issue costs	559,155	577,126
Accrued incentives and earn-outs	$ 9,041	$ 8,916

This element represents the liabilities for earn out payments.

No definition available.

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- 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.

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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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- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: 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(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: 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(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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