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Note 8 - Investment and Advances in Real Estate Joint Ventures - The Company's Share of Net Income/(Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income of joint ventures, net $ 218,714 $ 480,395 $ 159,560
Kim Pru and Kim Pru II [Member]      
Income of joint ventures, net 16,400 7,100 8,100
KIR [Member]      
Income of joint ventures, net 44,000 41,000 26,500
CPP [Member]      
Income of joint ventures, net 7,700 9,600 7,100
Other Institutional Programs [Member]      
Income of joint ventures, net 1,100 4,700 28,800
Other Joint Venture Programs [Member]      
Income of joint ventures, net 3,900 14,200 49,700
Canadian Properties [Member]      
Income of joint ventures, net $ 145,600 $ 403,800 $ 39,400