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INCOME TAXES - SCHEDULE OF INCOME TAX CONTINGENCIES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Deferred Tax Assets, Tax Deferred Expense, Other $ 8,456 $ 22,056  
Unrecognized Tax Benefits, Interest on Income Taxes Expense (100) (1,200) $ (8,700)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance January 1 6,181 5,436 20,033
Additions based on tax positions related to the current year 0 0 46
Additions for tax positions of prior years 0 3,298 402
Reductions for tax positions of prior years (155) (21) (378)
Settlements (1,025) (1,921) (9,638)
Lapse in statute of limitations (755) (728) (1,497)
Ending balance December 31 4,348 6,181 5,436
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation $ 102 $ 117 $ 3,532