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Income Taxes (Components of income tax expense (benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract    
Deferred Income Tax Expense (Benefit) $ 586 $ 2,443
Income Tax Expense (Benefit) $ 8,010 $ 9,204