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BASIS OF PRESENTATION - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
Recent accounting pronouncements          
Equity investments with readily determinable fair values $ 500        
Additional paid-in capital 170,069     $ 167,973  
Accumulated other comprehensive income 2,649     3,746  
Retained earnings 546,368     $ 552,948  
Net cash provided by operating activities 22,544 $ 32,089      
Net cash used in investing activities (7,077) (22,622)      
Net cash used in financing activities (18,130) (15,628)      
Effect of foreign currency exchange rates on total cash (31) 207      
Net change in cash, cash equivalents, and restricted cash (2,694) (5,954)      
Total cash, cash equivalents, and restricted cash, beginning of period 219,890 288,358      
Total cash, cash equivalents, and restricted cash, end of period 217,196 282,404      
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 500        
Adjustment | ASU 2016-01          
Recent accounting pronouncements          
Accumulated other comprehensive income     $ (200)    
Retained earnings     $ 200    
Adjustment | ASU 2016-09          
Recent accounting pronouncements          
Additional paid-in capital         $ (300)
Retained earnings         $ 300
Adjustment | ASU 2016-18          
Recent accounting pronouncements          
Net cash used in investing activities   (1,770)      
Net change in cash, cash equivalents, and restricted cash   (1,770)      
Total cash, cash equivalents, and restricted cash, beginning of period   18,637      
Total cash, cash equivalents, and restricted cash, end of period   16,867      
Adjustment | ASU 2017-07          
Recent accounting pronouncements          
Operating Expenses   37      
Other income   (37)      
Adjustment | ASU 2018-02 | Early Adoption          
Recent accounting pronouncements          
Accumulated other comprehensive income (800)        
Retained earnings 800        
Valuation allowance $ 800        
Under previous guidance | ASU 2016-18          
Recent accounting pronouncements          
Net cash provided by operating activities   32,089      
Net cash used in investing activities   (20,852)      
Net cash used in financing activities   (15,628)      
Effect of foreign currency exchange rates on total cash   207      
Net change in cash, cash equivalents, and restricted cash   (4,184)      
Total cash, cash equivalents, and restricted cash, beginning of period   269,721      
Total cash, cash equivalents, and restricted cash, end of period   $ 265,537