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REVENUE RECOGNITION - Summary of Impacts of Adopting Topic 606 on Consolidated Financial Statements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
ASSETS |  |  |  |  |
Other assets (current and non-current) | $ 60,395 |  | $ 60,395 |  |
Deferred income taxes | 10,534 |  | 10,534 |  | $ 27,022
TOTAL ASSETS | 833,249 |  | 833,249 |  | 779,956
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |
Deferred revenue (current and non-current) | 97,591 |  | 97,591 |  | 38,883
Retained earnings | 92,346 |  | 92,346 |  | 99,126
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 833,249 |  | 833,249 |  | $ 779,956
REVENUE | 56,149 | $ 102,513 | 99,721 | $ 158,079 |
Gross margin | 44,514 | 91,203 | 80,628 | 133,782 |
OPERATING INCOME | 10,911 | 60,519 | 15,430 | 72,577 |
INCOME BEFORE INCOME TAXES | 12,665 | 61,321 | 18,408 | 74,031 |
INCOME TAX EXPENSE | (1,851) | (14,134) | (1,635) | (16,479) |
NET INCOME | 10,814 | $ 47,187 | 16,773 | 57,552 |
Amortization of deferred revenue and recognition of unbilled receivables |  |  | (29,266) | (4,873) |
Deferred income tax expense |  |  | 19,312 | 7,408 |
Other assets (current and non-current) |  |  | (28,633) |  |
CASH FLOW FROM OPERATING ACTIVITIES |  |  | 49,952 | $ 56,629 |
Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |  |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |
REVENUE | 17,500 |  | 42,100 |  |
Adjustment [Member] | Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Other assets (current and non-current) | (2,246) |  | (2,246) |  |
Deferred income taxes | (10,970) |  | (10,970) |  |
TOTAL ASSETS | (13,216) |  | (13,216) |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |
Deferred revenue (current and non-current) | (65,368) |  | (65,368) |  |
Retained earnings | 52,152 |  | 52,152 |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | (13,216) |  | (13,216) |  |
REVENUE | 17,470 |  | 42,123 |  |
Gross margin | 17,470 |  | 42,123 |  |
OPERATING INCOME | 17,470 |  | 42,123 |  |
INCOME BEFORE INCOME TAXES | 17,470 |  | 42,123 |  |
INCOME TAX EXPENSE | (3,180) |  | (7,864) |  |
NET INCOME | 14,290 |  | 34,259 |  |
Amortization of deferred revenue and recognition of unbilled receivables |  |  | (47,475) |  |
Deferred income tax expense |  |  | 10,970 |  |
Other assets (current and non-current) |  |  | 2,246 |  |
Balances Without Adoption of Topic 606 [Member] | Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Other assets (current and non-current) | 58,149 |  | 58,149 |  |
Deferred income taxes | (436) |  | (436) |  |
TOTAL ASSETS | 820,033 |  | 820,033 |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |
Deferred revenue (current and non-current) | 32,223 |  | 32,223 |  |
Retained earnings | 144,498 |  | 144,498 |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 820,033 |  | 820,033 |  |
REVENUE | 73,619 |  | 141,844 |  |
Gross margin | 61,984 |  | 122,751 |  |
OPERATING INCOME | 28,381 |  | 57,553 |  |
INCOME BEFORE INCOME TAXES | 30,135 |  | 60,531 |  |
INCOME TAX EXPENSE | (5,031) |  | (9,499) |  |
NET INCOME | $ 25,104 |  | 51,032 |  |
Amortization of deferred revenue and recognition of unbilled receivables |  |  | (76,741) |  |
Deferred income tax expense |  |  | 30,282 |  |
Other assets (current and non-current) |  |  | (26,387) |  |
CASH FLOW FROM OPERATING ACTIVITIES |  |  | $ 49,952 |  |

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