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NEW ACCOUNTING STANDARDS - CUMULATIVE EFFECT OF CHANGES DUE TO ADOPTION OF ASU 2014-09 (TABLES) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
ASSETS.      
Prepaids and other current assets $ 71,840 $ 74,465 $ 63,668
Deferred tax assets, net, noncurrent 16,476 16,018 12,012
LIABILITIES.      
Deferred revenue 28,675 46,413 21,628
Retained earnings 707,257 711,682 $ 721,664
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
ASSETS.      
Prepaids and other current assets 4,606 10,797  
Deferred tax assets, net, noncurrent 2,247 4,006  
LIABILITIES.      
Deferred revenue 12,286 24,785  
Retained earnings $ (5,433) $ (9,982)