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Note 12 - Long-Term Debt Schedule of Long Term Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 27, 2017
Sep. 30, 2017
Mar. 31, 2016
Jun. 30, 2015
May 31, 2014
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 16, 2017
Nov. 30, 2016
Aug. 12, 2016
Debt Instrument [Line Items]                                        
Long-term debt           $ 1,027,074       $ 1,069,537         $ 1,027,074 $ 1,069,537        
Proceeds from termination of capped calls                             4,208 0 $ 13,150      
Loss on induced conversion and debt extinguishment           0 $ (45,766) $ (1,247) $ (4,456) 0   $ (17,397) $ (2,108) $ (55,570) (51,469) (75,075) $ (94,207)      
Senior Notes Due 2017                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Repurchased Face Amount                                       $ 195,500
Loss on induced conversion and debt extinguishment                     $ (15,000)                  
Repayments of Senior Debt                     $ 211,300                  
Senior Notes Due 2019 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Interest Rate, Stated Percentage         5.50%                              
Long-term debt           157,636       296,907         157,636 296,907        
Proceeds from Issuance of Long-term Debt         $ 293,800                              
Senior Notes Due 2020 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Interest Rate, Stated Percentage       5.25%                                
Long-term debt           231,834       345,308         231,834 345,308        
Debt Instrument, Face Amount       $ 350,000                                
Proceeds from Issuance of Long-term Debt       343,300                                
Senior Notes Due 2021 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Interest Rate, Stated Percentage     7.00%                     7.00%            
Long-term debt           $ 195,146       344,362         $ 195,146 344,362        
Debt Instrument, Face Amount     $ 350,000                     $ 350,000            
Proceeds from Issuance of Long-term Debt     343,400                                  
Senior Notes due 2019, 2020, and 2021 [Member]                                        
Debt Instrument [Line Items]                                        
Repayments of Senior Debt             $ 450,800                          
Convertible Senior Notes Due 2017 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Interest Rate, Stated Percentage           3.00%                 3.00%          
Long-term debt           $ 0       20,947         $ 0 20,947        
Repayments of Convertible Debt       126,800       31,600                        
Extinguishment of Debt, Amount       $ 389,100                                
Debt Conversion, Converted Instrument, Shares Issued       28.4                                
Gain (Loss) on Repurchase of Debt Instrument       $ (91,900)                                
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received       2.3                                
Convertible Debt, Termination of Capped Call Transaction, Total Consideration     $ 2,600 $ 54,900                                
Convertible Debt, Termination of Capped Call Transaction, Closing Stock Price     $ 11.86                     $ 11.86            
Convertible Debt, Termination of Capped Call Transaction, Total Cash Received       $ 13,200                                
Senior Notes Due 2024 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Interest Rate, Stated Percentage   4.50%         4.50%                          
Long-term debt           $ 442,458       0         $ 442,458 0        
Convertible Senior Notes Due 2019 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Interest Rate, Stated Percentage           2.25%                 2.25%          
Long-term debt           $ 0       62,013         $ 0 62,013        
Debt Instrument, Repurchased Face Amount $ 68,000                                      
Repayments of Convertible Debt 110,100                                      
Gain (Loss) on Repurchase of Debt Instrument $ (4,500)                                      
Debt Instrument, Convertible, Conversion Price                                     $ 10.60  
Senior Notes [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Redemption Price, Percentage                             100.00%          
Percent of Stock With Ordinary Voting Rights That the Company Must Retain In Order to Make Any Capital Stock Transactions Under Debt Covenant Agreement           80.00%                 80.00%          
Debt Instrument, Basis Spread on Variable Rate                             0.50%          
Senior Notes [Member] | Senior Notes Due 2019 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Repurchased Face Amount   $ 141,400         $ 141,400                          
Long-term Debt, Gross   158,600         158,600                          
Debt Instrument, Face Amount         $ 300,000                              
Senior Notes [Member] | Senior Notes Due 2020 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Repurchased Face Amount   115,900         115,900                          
Long-term Debt, Gross   234,100         234,100                          
Senior Notes [Member] | Senior Notes Due 2021 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Repurchased Face Amount   152,300         152,300                          
Long-term Debt, Gross   197,700         197,700                          
Senior Notes [Member] | Senior Notes due 2019, 2020, and 2021 [Member]                                        
Debt Instrument [Line Items]                                        
Gain (Loss) on Repurchase of Debt Instrument             (45,800)                          
Senior Notes [Member] | Senior Notes Due 2024 [Member]                                        
Debt Instrument [Line Items]                                        
Debt Instrument, Face Amount   450,000         $ 450,000                          
Proceeds from Issuance of Long-term Debt   $ 442,200                                    
Convertible Debt [Member]                                        
Debt Instrument [Line Items]                                        
Repayments of Convertible Debt                               235,000        
Debt Conversion, Converted Instrument, Shares Issued     17.0                                  
Gain (Loss) on Repurchase of Debt Instrument                               (60,100)        
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        
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received     0.2                                  
Convertible Debt [Member] | Convertible Senior Notes Due 2017 [Member]                                        
Debt Instrument [Line Items]                                        
Long-term debt           $ 0       20,947         $ 0 20,947        
Debt Instrument, Repurchased Face Amount               21,600   30,100           30,100        
Long-term Debt, Gross           0       22,233         0 22,233        
Gain (Loss) on Repurchase of Debt Instrument               $ (1,200)                        
Proceeds from termination of capped calls                             4,100          
Debt Instrument, Convertible, Carrying Amount of Equity Component                   5,000           5,000        
Convertible Debt [Member] | Convertible Senior Notes Due 2019 [Member]                                        
Debt Instrument [Line Items]                                        
Long-term debt           0       62,013         0 62,013        
Debt Instrument, Repurchased Face Amount                   322,000           322,000        
Long-term Debt, Gross           0       68,024         0 68,024        
Reduction in Dilutive Shares Attributable to Redemption of Conversion of Debt Securities 6.4                                      
Debt Instrument, Convertible, Carrying Amount of Equity Component                   $ 13,100           $ 13,100        
Revolving Credit Facility [Member]                                        
Debt Instrument [Line Items]                                        
Line of Credit Facility, Current Borrowing Capacity                                   $ 225,000    
Line of Credit Facility, Maximum Borrowing Capacity                                   $ 300,000    
Line of Credit Facility, Fair Value of Amount Outstanding           $ 0                 $ 0