DEBT (Revolving Credit Agreement) (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date		Jun. 30, 2022
Amounts due banks (Note 9)			$ 0	$ 2,020
Revolving credit agreement
Debt Instrument [Line Items]
Borrowing capacity under the line of credit			$ 400,000
Credit agreement initiation date	Jun. 30, 2017
Credit facility covenant compliance			As of December 31, 2018, the Company was in compliance with all of its covenants
Debt Instrument, Term			5 years
Additional increase in borrowing capacity of the line of credit available at the entity's option			$ 100,000