Investments in Affiliates (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	$ 34,356	$ 33,182	$ 33,077
Joint Venture Unconsolidated
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	34,356	33,182	33,077
Equity Method Investment, Summarized Financial Information, Assets	167,859	175,477	179,949
Equity Method Investments Summarized Financial Information Net Assets	95,128	104,370	106,239
Equity Method Investments	19,700	18,500	18,400
Joint Venture Unconsolidated | Other Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	9,718	9,079	8,984
Equity Method Investments	34,356	33,182	33,077
Joint Venture Unconsolidated | Equity Method investments in Real Estate Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	24,638	$ 24,103	$ 24,093
Joint Venture Unconsolidated | Minimum [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	22,400
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	300
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	$ 59,400