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Income Taxes (Components of income tax expense (benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract        
Deferred Income Tax Expense (Benefit)     $ 15,176 $ (1,329)
Income Tax Expense (Benefit) $ 3,627 $ 562 $ 15,146 $ 2,310