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OPERATING SEGMENTS (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Segment Reporting [Abstract]      
Segment assets $ 1,010,244 $ 988,117 $ 930,647
Investments in unconsolidated investees 6,993 6,396 6,294
Notes and interest receivable 126,507 112,095 106,874
Other assets 205,360   188,921
Total assets $ 1,349,104 $ 1,296,720 $ 1,232,736