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FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Document Fiscal Year Focus 2019      
Fair value option investments $ 32,494 $ 77,933 $ 73,902 $ 82,966
Gain (loss) from changes in fair value of investments (41,408) (5,033)    
Unrealized Gains (Losses) Still Held - Assets (41,408) (5,033)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 1,586 0 1,529 0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 22 0    
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) 35 0    
Fair Value, Measurement with Unobservable Inputs, Unrealized Gain Loss 22 0    
Convertible Debt Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value option investments 0 11,070 0 11,354
Unrealized Gains (Losses) Still Held - Assets 0 (284)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 (501)    
Unrealized Gain (Loss) on Securities 0 217    
Redeemable Preferred Stock [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value option investments 10,394 14,576 $ 10,340 $ 15,431
Unrealized Gains (Losses) Still Held - Assets 54 (855)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 54 0    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 0 $ (855)