Investments in Affiliates (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	$ 34,517	$ 33,182	$ 32,655
Joint Venture Unconsolidated [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	34,517	33,182	32,655
Equity Method Investment, Summarized Financial Information, Assets	176,275	175,477	175,503
Equity Method Investments Summarized Financial Information Net Assets	102,650	104,370	103,539
Equity Method Investments	19,400	18,500	17,500
Joint Venture Unconsolidated [Member] | Other Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	9,499	9,079	9,553
Equity Method Investments	34,517	33,182	32,655
Joint Venture Unconsolidated [Member] | Equity Method investments in Real Estate Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	25,018	$ 24,103	$ 23,102
Joint Venture Unconsolidated [Member] | Minimum [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	20,700
Joint Venture Unconsolidated [Member] | 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	1,700
Joint Venture Unconsolidated [Member] | Maximum [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	$ 65,900