Investments in Affiliates (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	$ 36,410	$ 35,668	$ 34,619
Joint Venture Unconsolidated
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	36,410	35,668	34,619
Equity Method Investment, Summarized Financial Information, Assets	150,637	155,506	177,072
Equity Method Investments Summarized Financial Information Net Assets	93,675	99,804	103,940
Equity Method Investments	21,800	20,800	19,700
Joint Venture Unconsolidated | Other Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	9,527	9,757	9,299
Equity Method Investments	36,410	35,668	34,619
Joint Venture Unconsolidated | Equity Method investments in Real Estate Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	26,883	$ 25,911	$ 25,320
Joint Venture Unconsolidated | Minimum [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	21,400
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	$ 63,600