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Note 11 - Long-Term Debt Schedule of Long Term Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 27, 2017
Sep. 30, 2017
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Nov. 30, 2016
Debt Instrument [Line Items]                  
Long-term debt   $ 1,026,806 $ 1,026,806     $ 1,026,806   $ 1,069,537  
Loss on induced conversion and debt extinguishment     $ (45,766)   $ (17,397) (51,469) $ (75,075)    
Proceeds from termination of capped calls           $ 4,109 $ 0    
Convertible Senior Notes Due 2017                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   3.00% 3.00%     3.00%      
Long-term debt   $ 521 $ 521     $ 521   20,947  
Repayments of Convertible Debt       $ 31,600          
Debt Instrument, Convertible, Carrying Amount of Equity Component   $ 100 $ 100     $ 100   5,000  
Convertible Senior Notes Due 2019                  
Debt Instrument [Line Items]                  
Debt Instrument, Repurchase Amount $ 68,000                
Debt Instrument, Interest Rate, Stated Percentage   2.25% 2.25%     2.25%      
Long-term debt   $ 0 $ 0     $ 0   62,013  
Debt Instrument, Convertible, Conversion Price                 $ 10.60
Repayments of Convertible Debt 110,100                
Loss on induced conversion and debt extinguishment $ (4,500)                
Debt Instrument, Convertible, Carrying Amount of Equity Component               13,100  
Senior Notes Due 2019 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   5.50% 5.50%     5.50%      
Long-term debt   $ 157,470 $ 157,470     $ 157,470   296,907  
Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   5.25% 5.25%     5.25%      
Long-term debt   $ 231,618 $ 231,618     $ 231,618   345,308  
Senior Notes Due 2021                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   7.00% 7.00%     7.00%      
Long-term debt   $ 194,974 $ 194,974     $ 194,974   344,362  
Senior Notes due 2019, 2020, and 2021 [Member]                  
Debt Instrument [Line Items]                  
Repayments of Senior Debt     $ 450,000            
Senior Notes Due 2024 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   4.50% 4.50%     4.50%      
Long-term debt   $ 442,223 $ 442,223     $ 442,223      
Senior Notes [Member] | Senior Notes Due 2019 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Repurchase Amount   141,400 141,400     141,400      
Debt Instrument, Face Amount   300,000 300,000     300,000      
Long-term Debt, Gross   158,600 158,600     158,600      
Senior Notes [Member] | Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Debt Instrument, Repurchase Amount   115,900 115,900     115,900      
Long-term Debt, Gross   234,100 234,100     234,100      
Senior Notes [Member] | Senior Notes Due 2021                  
Debt Instrument [Line Items]                  
Debt Instrument, Repurchase Amount   152,300 152,300     152,300      
Long-term Debt, Gross   197,700 197,700     $ 197,700      
Senior Notes [Member] | Senior Notes due 2019, 2020, and 2021 [Member]                  
Debt Instrument [Line Items]                  
Loss on induced conversion and debt extinguishment     (45,800)            
Senior Notes [Member] | Senior Notes Due 2024 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate           0.50%      
Debt Instrument, Face Amount   450,000 $ 450,000     $ 450,000      
Proceeds from Issuance of Long-term Debt   $ 443,300              
Debt Instrument, Redemption Price, Percentage           100.00%      
Percent of Stock With Ordinary Voting Rights That Company Must Retain In Order To Make Any Capital Stock Transactions Under Debt Covenant Agreement   80.00% 80.00%     80.00%      
Convertible Debt | Convertible Senior Notes Due 2017                  
Debt Instrument [Line Items]                  
Debt Instrument, Repurchase Amount       21,600          
Long-term debt   $ 521 $ 521     $ 521   20,947  
Loss on induced conversion and debt extinguishment       $ (1,200)          
Long-term Debt, Gross   526 526     526   22,233  
Convertible Debt | Convertible Senior Notes Due 2019                  
Debt Instrument [Line Items]                  
Long-term debt   0 0     0   62,013  
Long-term Debt, Gross   $ 0 $ 0     $ 0   $ 68,024