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Note 12 - Borrowings and Financing Activities Extinguishment of Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 27, 2017
Jun. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2016
Loss on extinguishment of debt             $ 22,738 $ 0 $ 51,469  
Proceeds from Hedge, Financing Activities             0 0 4,208  
Senior Notes due 2020 and 2021                    
Repayments of Senior Debt       $ 351,800            
Senior Notes due 2019, 2020, and 2021                    
Repayments of Senior Debt         $ 450,800          
Convertible Senior Notes Due 2017                    
Repayments of Convertible Debt           $ 31,600        
Convertible Senior Notes Due 2019                    
Loss on extinguishment of debt $ 4,500                  
Repayments of Convertible Debt 110,100                  
Debt Instrument, Convertible, Conversion Price                   $ 10.60
Senior Notes | Senior Notes Due 2019                    
Maturities of Senior Debt   $ 158,600                
Debt Instrument, Repurchased Face Amount         141,400          
Long-term Debt, Gross                 158,600  
Senior Notes | Senior Notes Due 2020                    
Debt Instrument, Repurchased Face Amount   207,200 $ 27,000 207,200 115,900   $ 0      
Long-term Debt, Gross                 234,100  
Senior Notes | Senior Notes Due 2021                    
Debt Instrument, Repurchased Face Amount   $ 127,300 70,400 127,300 152,300          
Long-term Debt, Gross                 197,700  
Senior Notes | Senior Notes due 2020 and 2021                    
Repayments of Senior Debt     103,100              
Loss on extinguishment of debt     $ 5,900 $ 16,800            
Senior Notes | Senior Notes due 2019, 2020, and 2021                    
Loss on extinguishment of debt         $ 45,800          
Convertible Debt | Convertible Senior Notes Due 2017                    
Debt Instrument, Repurchased Face Amount           21,600     $ 0  
Loss on extinguishment of debt           1,200        
Proceeds from Hedge, Financing Activities           $ 4,100        
Convertible Debt | Convertible Senior Notes Due 2019                    
Debt Instrument, Repurchased Face Amount $ 68,000             $ 0    
Reduction in Dilutive Shares Attributable to Redemption of Conversion of Debt Securities 6.4