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Note 6 - Long-Term Debt - Outstanding Principal Amounts (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Outstanding principal amounts $ 1,696,282 $ 1,771,330
Line of Credit [Member]    
Outstanding principal amounts 1,700  
Line of Credit [Member] | Term A Loan [Member]    
Outstanding principal amounts 241,325 248,351
Line of Credit [Member] | Refinancing Term B Loan [Member]    
Outstanding principal amounts 1,096,357 1,152,679
Line of Credit [Member] | Swing Loan [Member]    
Outstanding principal amounts 38,600 50,300
Revolving Credit Facility [Member] | Line of Credit [Member]    
Outstanding principal amounts $ 320,000 $ 320,000