Segment Information - Unconsolidated Real Estate Ventures (Parentheticals) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Other liabilities	$ 31,379	$ 37,558
Coppell Associates [Member]
Segment Reporting Information [Line Items]
Other liabilities	$ 1,100	$ 1,200

The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_OtherLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant