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Income Taxes (Components of income tax expense (benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract        
Deferred Income Tax Expense (Benefit)     $ 3,543 $ (1,316)
Income Tax Expense (Benefit) $ 5,858 $ 769 $ 11,519 $ 1,748