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Note 6 - Long-Term Debt - Outstanding Principal Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Outstanding principal amounts $ 1,592,308 $ 1,771,330
Line of Credit [Member] | Term A Loan [Member]    
Outstanding principal amounts 237,813 248,351
Line of Credit [Member] | Refinancing Term B Loan [Member]    
Outstanding principal amounts 1,058,195 1,152,679
Line of Credit [Member] | Swing Loan [Member]    
Outstanding principal amounts 31,300 50,300
Revolving Credit Facility [Member] | Line of Credit [Member]    
Outstanding principal amounts $ 265,000 $ 320,000