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Debt (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 31, 2019
Dec. 31, 2020
Debt Instrument [Line Items]        
Unamortized discounts $ 3,031 $ 3,680   $ 3,031
Debt instrument maturity date 2030 2029 2029  
Term Loans [Member]        
Debt Instrument [Line Items]        
Unamortized discounts $ 3,000     3,000
Long-term Debt, Gross 100,000     $ 100,000
Debt instrument maturity date       2025
Deltic [Member] | Term Loans [Member]        
Debt Instrument [Line Items]        
Unamortized discounts $ 4,900     $ 4,900