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Note 8 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Capital lease obligation $ 263 $ 267
Total debt 1,191,826 1,194,642
Less unamortized debt issuance costs (18,615) (19,585)
Less current portion (15,938) (14,375)
Total long-term debt 1,157,273 1,160,682
Senior Unsecured Notes Due 2022 [Member]    
Notes 450,000 450,000
Senior Credit Facilities Due 2020 [Member] | Term Loan [Member]    
Senior Credit Facilities $ 741,563 $ 744,375