INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Effective income tax rate
Effective income tax rate (as a percent)	26.20%	31.00%
Excess discreate tax (benefit) provision on share-based payment awards (as a percent)	2.30%	2.30%
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