INCOME TAXES (Details - U.S. TAX REFORM OVERVIEW) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax [Line Items]
U.S. federal income tax at statutory rate (as a percent)	21.00%	35.00%	21.00%	35.00%
Impact of Tax Act					$ 6,700.0
Tax charge attributable to the reduction in the U.S. corporate income tax					6,700.0
Tax benefit related to the deemed repatriation tax					$ 38.0
Tax Act Discount Period Extension, Minimum			10 years
Tax Act Discount Period Extension, Maximum			24 years