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REVENUE RECOGNITION - Summary of Impacts of Adopting Topic 606 on Consolidated Financial Statements (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
ASSETS |  |  |
Other assets (current and non-current) | $ 16,692,000 |  |
Deferred income taxes | 29,944,000 |  | $ 27,022,000
TOTAL ASSETS | 795,140,000 |  | 779,956,000
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |
Deferred revenue (current and non-current) | 79,236,000 |  | 38,883,000
Retained earnings | 84,360,000 |  | 99,126,000
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 795,140,000 |  | $ 779,956,000
REVENUE | 43,572,000 | $ 55,566,000 |
GROSS MARGIN | 36,114,000 | 42,579,000 |
OPERATING INCOME | 4,519,000 | 12,058,000 |
INCOME BEFORE INCOME TAXES | 5,743,000 | 12,710,000 |
INCOME TAX BENEFIT (EXPENSE) | 216,000 | (2,345,000) |
NET INCOME | 5,959,000 | 10,365,000 |
Amortization of deferred revenue | (12,589,000) | (2,690,000) |
Deferred income tax expense | 72,000 | 1,049,000 |
Other assets (current and non-current) | (4,202,000) |  |
CASH FLOW FROM OPERATING ACTIVITIES | 38,815,000 | $ 1,644,000 |
Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |
REVENUE | 24,700,000 |  |
Adjustment [Member] | Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |
ASSETS |  |  |
Other assets (current and non-current) | (1,401,000) |  |
Deferred income taxes | (7,790,000) |  |
TOTAL ASSETS | (9,191,000) |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |
Deferred revenue (current and non-current) | (47,054,000) |  |
Retained earnings | 37,863,000 |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | (9,191,000) |  |
REVENUE | 24,653,000 |  |
GROSS MARGIN | 24,653,000 |  |
OPERATING INCOME | 24,653,000 |  |
INCOME BEFORE INCOME TAXES | 24,653,000 |  |
INCOME TAX BENEFIT (EXPENSE) | (4,684,000) |  |
NET INCOME | 19,969,000 |  |
Amortization of deferred revenue | (29,160,000) |  |
Deferred income tax expense | 7,790,000 |  |
Other assets (current and non-current) | 1,401,000 |  |
Balances Without Adoption of Topic 606 [Member] | Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |
ASSETS |  |  |
Other assets (current and non-current) | 15,291,000 |  |
Deferred income taxes | 22,154,000 |  |
TOTAL ASSETS | 785,949,000 |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |
Deferred revenue (current and non-current) | 32,182,000 |  |
Retained earnings | 122,223,000 |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 785,949,000 |  |
REVENUE | 68,225,000 |  |
GROSS MARGIN | 60,767,000 |  |
OPERATING INCOME | 29,172,000 |  |
INCOME BEFORE INCOME TAXES | 30,396,000 |  |
INCOME TAX BENEFIT (EXPENSE) | (4,468,000) |  |
NET INCOME | 25,928,000 |  |
Amortization of deferred revenue | (41,749,000) |  |
Deferred income tax expense | 7,862,000 |  |
Other assets (current and non-current) | (2,801,000) |  |
CASH FLOW FROM OPERATING ACTIVITIES | $ 38,815,000 |  |

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