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FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Fair value of option investments, beginning balance $ 1,405 $ 73,902 $ 82,966
Total gains (losses) included in earnings (1,405) (72,497) (9,064)
Fair value of option investments, ending balance 0 1,405 73,902
Unrealized gain (losses) still held (1,405) (72,497) (9,064)
Contingent consideration, beginning balance 1,298 1,529 0
Issuance of contingent consideration in connection with acquisitions 0 0 1,589
Settlements of contingent consideration liabilities (908) (312) 0
Total losses (gains) included in earnings 6 39 56
Foreign currency translation (70) 42 (116)
Contingent consideration, ending balance 326 1,298 1,529
Unrealized (losses) gains still held 6 39 56
Convertible Debt Securities      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Unrealized gain (losses) still held 0 0 0
Convertible debt securities, beginning balance 0 0 11,354
Proceeds from sales and maturities of convertible debt securities 0 0 (8,594)
Transfer to other equity method investment upon conversion of convertible debt security 0 0 (4,008)
Total gains (losses) included in other comprehensive income (loss) 0 0 (1,148)
Gains (losses) included in earnings 0 0 2,396
Convertible debt securities, ending balance 0 0 0
Redeemable Preferred Stock      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Unrealized gain (losses) still held 0 (10,340) (5,091)
Total gains (losses) included in other comprehensive income (loss) 0 (379) 379
Redeemable preferred shares, beginning balance 0 10,340 15,431
Impairments included in earnings 0 (9,961) (5,470)
Redeemable preferred shares, ending balance $ 0 $ 0 $ 10,340