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INCOME TAXES - RECONCILIATION OF STATUTORY FEDERAL INCOME TAX RATE TO EFFECTIVE RATE (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of the statutory federal income tax rate to our effective tax rate      
Federal tax provision 21.00% 34.00% 34.00%
State taxes (net of federal benefit) 5.60% 4.80% 3.70%
Warrant gains 0.00% 0.40% 31.40%
Valuation allowance 0.40% 28.90% (71.80%)
Change in federal tax rate 0.00% (71.20%) 0.00%
Other 1.90% 6.20% 1.50%
Total 28.90% 3.10% (1.20%)