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Income Taxes (Components of income tax expense (benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract        
Deferred Income Tax Expense (Benefit)     $ 6,827 $ (2,619)
Income Tax Expense (Benefit) $ 12,255 $ 560 $ 29,860 $ 13,757