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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 |  |

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