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EQUITY METHOD INVESTMENTS AND INTERESTS IN JOINT VENTURES AND PARTNERSHIPS (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Gain (Loss) on Investments [Line Items]        
Net realized and unrealized gains (losses) $ 30,511 $ (6,408) $ (107,521) $ 13,491
Net income (loss) attributable to noncontrolling interests (1,281) (2,705) (16,816) (8,776)
Equity Investments        
Gain (Loss) on Investments [Line Items]        
Net realized gains (losses) (4,496) (58) (3,771) 1,366
Net (increase) decrease in unrealized losses (457) 29,799 (16,449) 7,373
Net realized and unrealized gains (losses) (4,953) 29,741 (20,220) 8,739
Interests in Joint Ventures and Partnerships        
Gain (Loss) on Investments [Line Items]        
Net realized gains (losses) 9,736 0 7,574 0
Net (increase) decrease in unrealized losses (5,346) 9,026 (88,439) (17,473)
Net realized and unrealized gains (losses) $ 4,390 $ 9,026 $ (80,865) $ (17,473)