Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Fair value measurements
Mortgage loans receivable	$ 204,476	$ 165,656
Senior unsecured notes	352,467	281,633
Contingent liabilities	$ 13,323	$ 3,258
Level 3 \| Senior Unsecured Notes Maturing Prior To 2020 Member
Fair value measurements
Discount rate (as a percent)	4.25%	3.80%
Level 3 \| Senior Unsecured Notes Maturing Beyond 2020 [Member]
Fair value measurements
Discount rate (as a percent)	4.45%	4.55%
Level 3 \| Earn-out liabilities
Fair value measurements
Discount rate (as a percent)	5.90%	6.20%
Level 3 \| Mortgage Receivable [Member]
Fair value measurements
Discount rate (as a percent)	8.80%	8.60%
Carrying Value
Fair value measurements
Bank borrowings	$ 165,500
Carrying Value \| Level 3
Fair value measurements
Mortgage loans receivable	204,476	$ 165,656
Senior unsecured notes	352,467	281,633
Contingent liabilities	13,323	3,258
Fair Value
Fair value measurements
Bank borrowings	165,500
Fair Value \| Level 3
Fair value measurements
Mortgage loans receivable	244,363	198,977
Senior unsecured notes	355,679	283,933
Contingent liabilities	$ 13,323	$ 3,258

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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)

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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

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

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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

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-Topic 942

-SubTopic 210

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