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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 |  |

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