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Income Taxes (Classification of Net Deferred Income Tax Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]    
Non-current assets $ 98,714 $ 88,526
Non-current liabilities (14,866) (18,606)
Net deferred tax assets $ 83,848 $ 69,920