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Note 5 - Long-term Debt - Outstanding Principal Amounts (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Outstanding principal amounts $ 1,925,887 $ 1,305,634
Line of Credit [Member] | Term A Loan [Member]    
Outstanding principal amounts 227,275 234,300
Line of Credit [Member] | Refinancing Term B Loan [Member]    
Outstanding principal amounts 768,712 795,034
Line of Credit [Member] | Swing Loan [Member]    
Outstanding principal amounts 64,900 41,300
Revolving Credit Facility [Member] | Line of Credit [Member]    
Outstanding principal amounts $ 865,000 $ 235,000