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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Redeemable Noncontrolling Interests (Details)
6 Months Ended
Jun. 30, 2017
Accounting Policies [Abstract]  
Expiration period of redeemable noncontrolling interests, low end of range 1 year
Expiration period of redeemable noncontrolling interests, high end of range 3 years