INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense	$ (8,396)	$ (3,043)	$ (22,443)	$ (16,817)
Effective income tax rate			16.50%	15.10%
Global intangible low-taxed income	1,400		$ 1,400
Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment due to adoption of ASU					$ 0
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment due to adoption of ASU	$ 700		$ 700		$ (711)