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Income Taxes (Schedule of Current Income Taxes Prepaid and Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Prepaid taxes $ 4,872 $ 3,914
Taxes receivable 1,394 1,299
Total current income taxes prepaid and receivable $ 6,266 $ 5,213