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Income Taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income tax expense $ 41,000 $ 27,000  
Effective income tax rate reconciliation, change in enacted tax rate, amount     $ 19,500,000
Changes in net deferred taxes $ 0