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FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Cost Method Investments [1]         $ 25,438    
Fair value option investments       $ 73,902 82,966 $ 82,584 $ 130,725
Available-for-sale Securities       10,340 26,785    
Cost Method Investments, Fair Value Disclosure [1]         32,792    
Restructuring charges $ 11,500 $ 4,600 $ 2,700 (136) 18,828 40,438  
Unrealized (Losses) Gains Still Held - Liabilities [2]       56 0 3,966  
Business Combination, Contingent Consideration, Liability       1,529 0 14,588 10,781
Fair Value, Measurements, Recurring              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Assets:         137,975    
Fair value option investments       73,902 82,966    
Fair Value, Measurements, Recurring | Level 1              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Assets:         137,975    
Fair value option investments       0 0    
Business Combination, Contingent Consideration, Liability       0      
Fair Value, Measurements, Recurring | Level 2              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Assets:         0    
Fair value option investments       0 0    
Business Combination, Contingent Consideration, Liability       0      
Fair Value, Measurements, Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Assets:         0    
Fair value option investments       73,902 82,966    
Business Combination, Contingent Consideration, Liability       1,529      
Redeemable Preferred Stock | Fair Value, Measurements, Recurring              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Available-for-sale Securities       10,340 15,431    
Redeemable Preferred Stock | Fair Value, Measurements, Recurring | Level 1              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Available-for-sale Securities       0 0    
Redeemable Preferred Stock | Fair Value, Measurements, Recurring | Level 2              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Available-for-sale Securities       0 0    
Redeemable Preferred Stock | Fair Value, Measurements, Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Available-for-sale Securities       10,340 15,431    
Asset Impairments Related to Restructuring              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Restructuring charges       0 0 328  
Convertible Debt Securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Fair value option investments       0 11,354 10,038 10,116
Redeemable Preferred Stock              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities       5,470 2,944 0  
Transfer to Cost Method Investment Classification       0 0 (4,574)  
Fair value option investments       $ 10,340 $ 15,431 $ 17,444 $ 22,834
[1] (1)See Note 2, Summary of Significant Accounting Policies, and Note 7, Investments, for information about our adoption of ASU 2016-01 on January 1, 2018 and its impact on accounting for equity investments without readily determinable fair values that were previously subject to the cost method of accounting.
[2] (1)Represents the unrealized gains or losses recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.