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Income Taxes, Components of Deferred Taxes, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Net noncurrent deferred tax assets $ 33,785 $ 35,752
Net noncurrent deferred tax liabilities 36,718 643
Deferred taxes, net   $ 35,109
Deferred taxes, net $ (2,933)