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Note 8 - Long-term Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Variable interest rate term notes $ 80,355 $ 96,157
Fixed interest rate term notes 520,818 515,371
Total 601,173 611,528
Less: current maturities (161,955) (145,139)
Total long-term debt, net of current maturities $ 439,218 $ 466,389