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Income Taxes (Components of income tax expense (benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract        
Deferred Income Tax Expense (Benefit)     $ (1,329) $ 20,418
Income Tax Expense (Benefit) $ 562 $ 7,998 $ 2,310 $ 30,396