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Note 11 - Borrowings and Financing Activities Repayment and Extinguishment of Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Loss on extinguishment of debt   $ (5,940)   $ 0 $ (22,738) $ 0
Senior Notes | Senior Notes Due 2019            
Maturities of Senior Debt $ 158,600          
Senior Notes | Senior Notes Due 2020            
Debt Instrument, Repurchased Face Amount 207,200 27,000 $ 207,200   27,000  
Long-term Debt, Gross   0     0  
Senior Notes | Senior Notes Due 2021            
Debt Instrument, Repurchased Face Amount $ 127,300 70,400 127,300   70,400  
Long-term Debt, Gross   0     $ 0  
Senior Notes | Senior Notes due 2020 and 2021            
Repayments of Senior Debt   103,100 351,800      
Loss on extinguishment of debt   $ (5,900) $ (16,800)