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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Federal income tax benefit attributable to:    
Current operations $ 715,000 $ 523,000
Permanent and timing differences (net) (280,000) 133,000
Tax rate change (1,600,000)
Valuation allowance 1,165,000 (656,000)
Net provision for federal income tax