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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]    
Percent of tax benefit received from increases in tax basis paid to stockholders 85.00%  
Unrealized deferred tax asset $ 306,231 $ 325,405
Realization period for deferred tax asset 10 years  
Corporate Federal Tax Rate 21.00%