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Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Total debt    
Amounts payable within one year $ (5,000) $ 0
Long-term debt, noncurrent 15,000 25,000
Revolving credit facility [Member]    
Total debt    
Long-term debt, noncurrent $ 20,000 $ 25,000