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Debt:Summary Table (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Deferred financing costs $ (6,688,000) $ (7,371,000)
Long-term debt 438,312,000 437,629,000
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 50,000,000 50,000,000
Term Loan Due 2026 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 45,000,000 45,000,000
5.625% Senior Notes Due 2024 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 350,000,000 $ 350,000,000