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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | [1] | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets (current and non-current) | $ 70,892 |  |  |  |  |  |  |  |  | $ 70,892 |  |  |
Deferred income taxes | 24,377 |  |  |  | $ 27,022 |  |  |  |  | 24,377 | $ 27,022 |  |
TOTAL ASSETS | 933,424 |  |  |  | 779,956 |  |  |  |  | 933,424 | 779,956 |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue (current and non-current) | 122,567 |  |  |  | 38,883 |  |  |  |  | 122,567 | 38,883 |  |
Retained earnings | 129,552 |  |  |  | 99,126 |  |  |  |  | 129,552 | 99,126 |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 933,424 |  |  |  | 779,956 |  |  |  |  | 933,424 | 779,956 |  |
REVENUE | 70,143 | $ 77,550 | $ 56,149 | $ 43,572 | 115,867 | [1],[2] | $ 61,683 | $ 102,513 | $ 55,566 | 247,414 | 335,629 | $ 198,886 |
Gross margin |  |  |  |  |  |  |  |  |  | 193,873 | 280,931 | 172,598 |
OPERATING INCOME |  |  |  |  |  |  |  |  |  | 56,735 | 146,247 | 68,413 |
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  |  | 64,311 | 149,537 | 68,598 |
INCOME TAX EXPENSE |  |  |  |  |  |  |  |  |  | (5,471) | (45,652) | (20,528) |
NET INCOME | 19,249 | $ 22,818 | $ 10,814 | $ 5,959 | $ 32,813 | [1],[2] | $ 13,520 | $ 47,187 | $ 10,365 | 58,840 | 103,885 | 48,070 | $ 48,070
Amortization of deferred revenue and recognition of unbilled receivables |  |  |  |  |  |  |  |  |  | (68,905) | (11,122) | (7,406) |
Deferred income tax expense |  |  |  |  |  |  |  |  |  | (12,814) | 24,396 | 3,094 |
Other assets (current and non-current) |  |  |  |  |  |  |  |  |  | (59,062) |  |  |
CASH FLOW FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  | 121,796 | $ 133,365 | $ 80,338 |
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 |  |  |
Amortization of deferred revenue and recognition of unbilled receivables |  |  |  |  |  |  |  |  |  | (81,991) |  |  |
Deferred income tax 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 |  |  |
Amortization of deferred revenue and recognition of unbilled receivables |  |  |  |  |  |  |  |  |  | (150,896) |  |  |
Deferred income tax expense |  |  |  |  |  |  |  |  |  | (2,456) |  |  |
Other assets (current and non-current) |  |  |  |  |  |  |  |  |  | (59,062) |  |  |
CASH FLOW FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  | $ 121,796 |  |  |
[1] | Prior to the adoption of ASC 606 on January 1, 2018, the Company recorded as revenue the receipt of the semi-annual license fee payment of $45.0 million from SDC in the second and fourth quarters.
[2] | The enactment of the Tax Cuts and Jobs Act in December 2017 resulted in a one-time charge of $11.5 million in the fourth quarter.

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