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Note 12 - Senior Notes 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
Mar. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 30, 2016
Aug. 12, 2016
Gain (Loss) on Repurchase of Debt Instrument               $ 0 $ 51,469 $ 75,075    
Proceeds from Hedge, Financing Activities               0 4,208 0    
Loss on induced conversion and debt extinguishment     $ 0 $ 45,766 $ 1,247 $ 4,456   $ 0 51,469 75,075    
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                        
Gain (Loss) on Repurchase of Debt Instrument $ 4,500                      
Repayments of Convertible Debt 110,100                      
Debt Instrument, Convertible, Conversion Price                     $ 10.60  
Senior Notes | Senior Notes Due 2019                        
Debt Instrument, Repurchased Face Amount       141,400                
Long-term Debt, Gross     158,600           158,600      
Senior Notes | Senior Notes Due 2020                        
Debt Instrument, Repurchased Face Amount       115,900                
Long-term Debt, Gross     234,100           234,100      
Senior Notes | Senior Notes Due 2021                        
Debt Instrument, Repurchased Face Amount       152,300                
Long-term Debt, Gross     197,700           197,700      
Senior Notes | Senior Notes due 2019, 2020, and 2021                        
Gain (Loss) on Repurchase of Debt Instrument       $ 45,800                
Senior Notes | Senior Notes Due 2017                        
Debt Instrument, Repurchased Face Amount                       $ 195,500
Repayments of Senior Debt             $ 211,300          
Loss on induced conversion and debt extinguishment             $ 15,000          
Convertible Debt | Convertible Senior Notes Due 2017                        
Debt Instrument, Repurchased Face Amount     0   21,600       0 30,100    
Gain (Loss) on Repurchase of Debt Instrument         1,200              
Proceeds from Hedge, Financing Activities         $ 4,100              
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received   0.2                    
Convertible Debt, Termination of Capped Call Transaction, Total Consideration   $ 2,600                    
Convertible Debt, Termination of Capped Call Transaction, Closing Stock Price   $ 11.86                    
Convertible Debt | Convertible Senior Notes Due 2019                        
Debt Instrument, Repurchased Face Amount $ 68,000   $ 0           $ 0 322,000    
Reduction in Dilutive Shares Attributable to Redemption of Conversion of Debt Securities 6.4                      
Convertible Debt | Convertible Senior Notes Due 2017 and 2019                        
Gain (Loss) on Repurchase of Debt Instrument                   60,100    
Repayments of Convertible Debt                   235,000    
Debt Conversion, Converted Instrument, Shares Issued   17.0                    
Induced Conversion of Convertible Debt Expense                   41,800    
Loss on induced conversion and debt extinguishment                   17,200    
Write off of Deferred Debt Issuance Cost                   $ 1,100