DERIVATIVES (NOTIONAL TABLE) (Details) ₱ in Thousands, $ in Thousands, $ in Thousands	Sep. 30, 2018 PHP (₱)	Sep. 30, 2018 MXN ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 PHP (₱)	Dec. 31, 2017 MXN ($)	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Notional Amount			$ 104,500			$ 176,200
Foreign Exchange Forward
Derivative [Line Items]
Notional Amount			188,271			313,506
Foreign Exchange Forward | PHP
Derivative [Line Items]
Notional Amount	₱ 6,344,375		$ 126,360	₱ 10,685,000		219,917
% Maturing in the Next 12 Months	59.90%	59.90%	59.90%
Foreign Exchange Forward | MXN
Derivative [Line Items]
Notional Amount		$ 1,114,000	$ 61,911		$ 1,609,000	$ 93,589
% Maturing in the Next 12 Months	55.70%	55.70%	55.70%