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Income Taxes (Components of income tax expense (benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract        
Deferred Income Tax Expense (Benefit)     $ (2,619) $ 15,176
Income Tax Expense (Benefit) $ 560 $ 3,627 $ 13,757 $ 15,146