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Debt:Summary Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Deferred financing costs $ (6,417) $ (4,456)
Long-term debt 443,583 440,544
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 0 0
Term Loan Due 2025 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 50,000 50,000
Long-term debt 50,000  
Term Loan Due 2026 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 0 45,000
4.875% Senior Notes Due 2030 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 400,000 0
5.625% Senior Notes Due 2024 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 0 $ 350,000