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BASIS OF PRESENTATION - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Jan. 01, 2016
Recent accounting pronouncements        
Equity investments with readily determinable fair values $ 300 $ 300    
Accumulated other comprehensive income (1,433) (1,609)    
Retained earnings 559,319 563,593    
ASU 2016-01        
Recent accounting pronouncements        
Equity investments that do not have readily determinable fair values       $ 20,100
Equity investments with readily determinable fair values       600
ASU 2018-15 | Early Adoption        
Recent accounting pronouncements        
Capitalized implementation costs 500 $ 600    
Amortization of implementation costs $ 0      
Adjustment | ASU 2016-01        
Recent accounting pronouncements        
Accumulated other comprehensive income       (200)
Retained earnings       $ 200
Adjustment | ASU 2018-02 | Early Adoption        
Recent accounting pronouncements        
Accumulated other comprehensive income     $ (800)  
Retained earnings     800  
Valuation allowance     $ 800