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BASIS OF PRESENTATION - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
Recent accounting pronouncements              
Equity investments with readily determinable fair values $ 400   $ 400        
Additional paid-in capital 172,170   172,170     $ 167,973  
Accumulated other comprehensive income 141   141     3,746  
Retained earnings 550,872   550,872     $ 552,948  
Net cash provided by operating activities     46,037 $ 65,467      
Net cash used in investing activities     (58,838) (90,033)      
Net cash used in financing activities     (26,784) (15,488)      
Effect of foreign currency exchange rates on total cash     (178) 207      
Net change in cash, cash equivalents, and restricted cash     (39,763) (39,847)      
Total cash, cash equivalents, and restricted cash, beginning of period     219,890 288,358      
Total cash, cash equivalents, and restricted cash, end of period 180,127 $ 248,511 180,127 248,511      
Operating Expenses 102,035 107,442 202,301 217,804      
Operating income (loss) 15,753 15,803 19,962 33,556      
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    
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 2018-02 | Early Adoption              
Recent accounting pronouncements              
Accumulated other comprehensive income (800)   (800)        
Retained earnings 800   800        
Valuation allowance $ 800   $ 800        
Change | ASU 2016-18              
Recent accounting pronouncements              
Net cash used in investing activities       (588)      
Net cash used in financing activities       (1,178)      
Net change in cash, cash equivalents, and restricted cash       (1,766)      
Total cash, cash equivalents, and restricted cash, beginning of period       18,637      
Total cash, cash equivalents, and restricted cash, end of period   16,871   16,871      
Change | ASU 2017-07              
Recent accounting pronouncements              
Operating Expenses   40   80      
Other Income   (40)   (80)      
Under previous guidance | ASU 2016-18              
Recent accounting pronouncements              
Net cash provided by operating activities       65,467      
Net cash used in investing activities       (89,445)      
Net cash used in financing activities       (14,310)      
Effect of foreign currency exchange rates on total cash       207      
Net change in cash, cash equivalents, and restricted cash       (38,081)      
Total cash, cash equivalents, and restricted cash, beginning of period       269,721      
Total cash, cash equivalents, and restricted cash, end of period   $ 231,640   $ 231,640