INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Effective income tax rate
Effective income tax rate (as a percent)	26.70%	33.10%	26.80%	32.10%
Excess discreate tax (benefit) provision on share-based payment awards (as a percent)	0.60%	0.20%	1.10%	1.10%
US federal corporate tax rate (as a percent)			21.00%		35.00%
Provisional amount related to the remeasurement of deferred tax balance					$ (7)
Transition tax liability for foreign subsidiaries, resulting in a transition tax liability					$ 3,140
Deferred Income Tax Benefit From Foreign Operating Losses And Tax Credit Carryforwards	$ 0		$ 0