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REVENUE RECOGNITION - Summary of Impacts of Adopting Topic 606 on Consolidated Financial Statements (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
ASSETS                        
Other assets (current and non-current)         $ 70,892         $ 70,892    
Deferred income taxes $ 30,375       24,377       $ 30,375 24,377    
TOTAL ASSETS 1,120,157       933,424       1,120,157 933,424    
LIABILITIES AND SHAREHOLDERS’ EQUITY                        
Deferred revenue (current and non-current) 144,862       122,567       144,862 122,567 $ 38,883  
Retained earnings 249,003       129,552       249,003 129,552    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 1,120,157       933,424       1,120,157 933,424    
REVENUE 101,729 $ 97,515 $ 118,168 $ 87,765 70,143 $ 77,550 $ 56,149 $ 43,572 405,177 247,414 335,629  
Gross margin                 329,803 193,873 280,931  
OPERATING INCOME                 158,343 56,735 146,247  
INCOME BEFORE INCOME TAXES                 169,905 64,311 149,537  
INCOME TAX EXPENSE                 (31,601) (5,471) (45,652)  
NET INCOME $ 26,428 $ 36,962 $ 43,440 $ 31,474 19,249 $ 22,818 $ 10,814 $ 5,959 138,304 58,840 103,885 $ 103,885
CASH FLOWS FROM OPERATING ACTIVITIES:                        
Amortization of deferred revenue and recognition of unbilled receivables                 (135,368) (68,905) (11,122)  
Deferred income tax (benefit) expense                 (5,776) (12,814) 24,396  
Other assets (current and non-current)                   (59,062)    
Net cash provided by operating activities                 $ 193,912 121,796 $ 133,365  
Revenue from Contracts with Customers - ASU No. 2014-09 [Member]                        
LIABILITIES AND SHAREHOLDERS’ EQUITY                        
REVENUE                   78,900    
Adjustment [Member] | Revenue from Contracts with Customers - ASU No. 2014-09 [Member]                        
ASSETS                        
Deferred income taxes         (11,153)         (11,153)    
TOTAL ASSETS         (11,153)         (11,153)    
LIABILITIES AND SHAREHOLDERS’ EQUITY                        
Deferred revenue (current and non-current)         (99,885)         (99,885)    
Retained earnings         88,732         88,732    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY         (11,153)         (11,153)    
REVENUE                   78,885    
Gross margin                   78,885    
OPERATING INCOME                   78,885    
INCOME BEFORE INCOME TAXES                   78,885    
INCOME TAX EXPENSE                   (7,252)    
NET INCOME                   71,633    
CASH FLOWS FROM OPERATING ACTIVITIES:                        
Amortization of deferred revenue and recognition of unbilled receivables                   (81,991)    
Deferred income tax (benefit) expense                   10,358    
Balances Without Adoption of Topic 606 [Member] | Revenue from Contracts with Customers - ASU No. 2014-09 [Member]                        
ASSETS                        
Other assets (current and non-current)         70,892         70,892    
Deferred income taxes         13,224         13,224    
TOTAL ASSETS         922,271         922,271    
LIABILITIES AND SHAREHOLDERS’ EQUITY                        
Deferred revenue (current and non-current)         22,682         22,682    
Retained earnings         218,284         218,284    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY         $ 922,271         922,271    
REVENUE                   326,299    
Gross margin                   272,758    
OPERATING INCOME                   135,620    
INCOME BEFORE INCOME TAXES                   143,196    
INCOME TAX EXPENSE                   (12,723)    
NET INCOME                   130,473    
CASH FLOWS FROM OPERATING ACTIVITIES:                        
Amortization of deferred revenue and recognition of unbilled receivables                   (150,896)    
Deferred income tax (benefit) expense                   (2,456)    
Other assets (current and non-current)                   (59,062)    
Net cash provided by operating activities                   $ 121,796