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MANDATORILY REDEEMABLE NONCONTROLLING INTEREST (ROLLFORWARD TABLE) (DETAILS) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mandatorily redeemable noncontrolling interest [Line Items]        
Mandatorily redeemable noncontrolling interest, January 1     $ 4,131  
Net income attributable to mandatorily redeemable noncontrolling interest $ 12,649 $ 12,438 37,096 $ 47,966
Change in redemption value     (466)  
Purchase of mandatorily redeemable noncontrolling interest     (4,105)  
Iknowtion [Member]        
Mandatorily redeemable noncontrolling interest [Line Items]        
Mandatorily redeemable noncontrolling interest, January 1     4,131 2,814
Net income attributable to mandatorily redeemable noncontrolling interest       537
Working capital distributed to mandatorily redeemable noncontrolling interest     (492) (632)
Change in redemption value     466 1,201
Purchase of mandatorily redeemable noncontrolling interest     $ (4,105)  
Mandatorily redeemable noncontrolling interest, September 30   $ 3,920   $ 3,920