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NEW ACCOUNTING STANDARDS - CUMULATIVE EFFECT OF CHANGES DUE TO ADOPTION OF ASU 2014-09 (TABLES) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
ASSETS.
Prepaids and other current assets	$ 86,054	$ 74,465	$ 63,668
Deferred tax assets, net, noncurrent	22,335	16,018	12,012
LIABILITIES.
Deferred revenue	33,555	46,413	21,628
Retained earnings	$ 705,218	$ 711,682	$ 721,664

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