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NEW ACCOUNTING STANDARDS - CUMULATIVE EFFECT OF CHANGES DUE TO ADOPTION OF ASU 2014-09 (TABLES) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
ASSETS. |  |  |
Prepaids and other current assets | $ 70,956 | $ 74,465 | $ 63,668
Deferred tax assets, net, noncurrent | 17,477 | 16,018 | 12,012
LIABILITIES. |  |  |
Deferred revenue | 25,132 | 46,413 | 21,628
Retained earnings | 712,775 | 711,682 | $ 721,664
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
ASSETS. |  |  |
Prepaids and other current assets | 3,808 | 10,797 |
Deferred tax assets, net, noncurrent | 1,836 | 4,006 |
LIABILITIES. |  |  |
Deferred revenue | 9,881 | 24,785 |
Retained earnings | $ (8,291) | $ (9,982) |

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