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Note 5 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Long-term Debt $ 544,030  
Capital lease obligation 280 $ 284
Total debt 544,030 545,284
Less unamortized debt issuance costs (7,748) (8,148)
Less current portion of long-term debt (6,875) (6,250)
Total Long-term debt 529,407 530,886
Senior Unsecured Notes Due 2022 [Member]    
Senior Unsecured Notes 450,000 450,000
Senior Credit Facilities Due 2020 [Member] | Term Loan [Member]    
Long-term Debt $ 93,750 $ 95,000