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INCOME TAXES (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at the beginning of the year $ 18,499 $ 14,332
Increase related to current year tax provisions 1,448 1,975
Increase related to prior years' tax positions 1,460 5,188
Unrecognized Tax Benefits, Increase Resulting from Acquisition 8,223 0
Decrease related to settlements with taxing authorities (522) (265)
Resolution of and other decreases in prior years' tax liabilities (1,734) (1,982)
Other 1,075 (749)
Balance at the end of the year 28,449 18,499
Interest and penalties expense (benefit) 1,079 597
Accrued interest and penalties 8,135 6,431
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 12,709 $ 9,813
Reasonably possible further reduction in prior years' unrecognized tax benefits during the next twelve months $ 2,414