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INCOME TAXES (Details 4)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Income Tax Provision to the Luxembourg income tax rate      
Statutory tax rate 26.01% 27.08% 29.22%
Change in valuation allowance 43.08% 119.20% (0.08%)
State tax expense 28.58% 0.50% 2.30%
Tax credits (0.00%) (2.13%) (1.81%)
Uncertain tax positions 114.18% 30.16% (3.65%)
Unrecognized tax loss 0.00% (1008.20%) 0.00%
Income tax rate change 0.00% 57.36% 0.00%
Tax rate differences on foreign earnings 73.11% 0.00% 0.00%
Other 7.96% (4.91%) 3.20%
Effective tax rate 292.92% (780.94%) 29.18%