TAXES PAYABLE (Components of Current Taxes Payable) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Schedule of Taxes Payable [Line Items]
Income taxes payable	$ 9,488	$ 27,538
Value added taxes payable	14,676	19,985
Payroll, social security, and other taxes payable	16,696	20,322
Total	40,860	67,845
Income taxes payable related to one-time transition tax, noncurrent	59,874	43,685
U.S. Tax Cuts and Jobs Act
Schedule of Taxes Payable [Line Items]
Income tax payable related to one-time transition tax	$ 64,321	59,386
Income tax payment period	8 years
U.S. Tax Cuts and Jobs Act | Taxes Payable, Noncurrent
Schedule of Taxes Payable [Line Items]
Income taxes payable related to one-time transition tax, noncurrent	$ 59,175	$ 42,253