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Income Tax Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax [Abstract]        
Increase (Decrease) in Deferred Income Taxes     $ (1,380) $ 0
Income Tax Expense (Benefit) $ 1,319 $ 337 $ 1,967 $ 323