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REVENUE RECOGNITION - Summary of Impacts of Adopting Topic 606 on Consolidated Financial Statements (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
ASSETS          
Other assets (current and non-current) $ 51,094   $ 51,094    
Deferred income taxes 13,910   13,910   $ 27,022
TOTAL ASSETS 883,744   883,744   779,956
LIABILITIES AND SHAREHOLDERS’ EQUITY          
Deferred revenue (current and non-current) 109,827   109,827   38,883
Retained earnings 112,337   112,337   99,126
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 883,744   883,744   $ 779,956
REVENUE 77,550 $ 61,683 177,271 $ 219,762  
Gross margin 61,427 48,218 142,055 182,000  
OPERATING INCOME 26,032 15,790 41,462 88,367  
INCOME BEFORE INCOME TAXES 28,143 16,657 46,551 90,688  
INCOME TAX EXPENSE (5,325) (3,137) (6,960) (19,616)  
NET INCOME 22,818 $ 13,520 39,591 71,072  
Amortization of deferred revenue and recognition of unbilled receivables     (52,325) (7,206)  
Deferred income tax expense     15,820 6,804  
Other assets (current and non-current)     (37,885)    
CASH FLOW FROM OPERATING ACTIVITIES     94,956 $ 71,261  
Revenue from Contracts with Customers - ASU No. 2014-09 [Member]          
LIABILITIES AND SHAREHOLDERS’ EQUITY          
REVENUE 14,100   56,200    
Adjustment [Member] | Revenue from Contracts with Customers - ASU No. 2014-09 [Member]          
ASSETS          
Other assets (current and non-current) (2,049)   (2,049)    
Deferred income taxes (13,640)   (13,640)    
TOTAL ASSETS (15,689)   (15,689)    
LIABILITIES AND SHAREHOLDERS’ EQUITY          
Deferred revenue (current and non-current) (79,226)   (79,226)    
Retained earnings 63,537   63,537    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY (15,689)   (15,689)    
REVENUE 14,054   56,177    
Gross margin 14,054   56,177    
OPERATING INCOME 14,054   56,177    
INCOME BEFORE INCOME TAXES 14,054   56,177    
INCOME TAX EXPENSE (2,670)   (10,534)    
NET INCOME 11,384   45,643    
Amortization of deferred revenue and recognition of unbilled receivables     (61,332)    
Deferred income tax expense     13,640    
Other assets (current and non-current)     2,049    
Balances Without Adoption of Topic 606 [Member] | Revenue from Contracts with Customers - ASU No. 2014-09 [Member]          
ASSETS          
Other assets (current and non-current) 49,045   49,045    
Deferred income taxes 270   270    
TOTAL ASSETS 868,055   868,055    
LIABILITIES AND SHAREHOLDERS’ EQUITY          
Deferred revenue (current and non-current) 30,601   30,601    
Retained earnings 175,874   175,874    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 868,055   868,055    
REVENUE 91,604   233,448    
Gross margin 75,481   198,232    
OPERATING INCOME 40,086   97,639    
INCOME BEFORE INCOME TAXES 42,197   102,728    
INCOME TAX EXPENSE (7,995)   (17,494)    
NET INCOME $ 34,202   85,234    
Amortization of deferred revenue and recognition of unbilled receivables     (113,657)    
Deferred income tax expense     29,460    
Other assets (current and non-current)     (35,836)    
CASH FLOW FROM OPERATING ACTIVITIES     $ 94,956