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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Equity investments without readily determinable fair value $ 30,900   $ 32,300
Equity investments, fair value 18,500   12,200
Cumulative effect of adoption of new accounting standard     2,100
Net cash flows from (used in) investing activities (57,415) $ 103,369  
Net cash flows from (used in) financing activities $ (178,999) 294,708  
Accounting Standards Update 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adoption of new accounting standard     $ 2,100
Accounting Standards Update 2016-15      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net cash flows from (used in) investing activities   2,000  
Net cash flows from (used in) financing activities   $ 1,500