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Debt:Summary Table (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Aug. 29, 2016
Debt Instrument [Line Items]      
Deferred financing costs $ (5,572) $ (6,688)  
Long-term debt 439,428 438,312  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 0 0  
Asset Based Credit Facility Term Loan [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 50,000 50,000  
Term Loan Due 2026 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 45,000 45,000  
5.625% Senior Notes Due 2024 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 350,000 $ 350,000 $ 350,000