Investments in Affiliates (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	$ 39,946	$ 35,668	$ 34,356
Joint Venture Unconsolidated
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	39,946	35,668	34,356
Equity Method Investment, Summarized Financial Information, Assets	163,714	155,506	167,859
Equity Method Investments Summarized Financial Information Net Assets	98,490	99,804	95,128
Equity Method Investments	23,600	20,800	19,700
Joint Venture Unconsolidated \| Other Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	11,312	9,757	9,718
Equity Method Investments	39,946	35,668	34,356
Joint Venture Unconsolidated \| Equity Method investments in Real Estate Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	28,634	$ 25,911	$ 24,638
Joint Venture Unconsolidated \| Minimum [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	26,500
Joint Venture Unconsolidated \| Minimum [Member] \| Real Estate Entities [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in and Advances to Affiliates [Line Items]
Real Estate Development Projects Range of Total Assets	1,600
Joint Venture Unconsolidated \| Maximum \| Real Estate Entities [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in and Advances to Affiliates [Line Items]
Real Estate Development Projects Range of Total Assets	$ 73,100

Equity Method Investments Summarized Financial Information Net Assets

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Non-Real Estate Development Projects Range of Total Assets

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Real Estate Development Projects Range of Total Assets

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The amount of assets reported by an equity method investment of the entity.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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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.

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