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Investment in Unconsolidated Joint Ventures (Cousins Watkins LLC) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]      
Operating distributions from unconsolidated joint ventures $ 8,760 $ 10,296 $ 67,101