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OPERATING SEGMENTS (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting [Abstract]        
Segment assets $ 988,117 $ 901,006 $ 853,507  
Investments in unconsolidated subsidiaries and investees 6,396 6,087 8,365  
Notes and interest receivable 112,095 126,564 120,243 $ 152,645
Other assets and receivables 190,112 141,252 135,253  
Total assets $ 1,296,720 $ 1,174,909 $ 1,117,368