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Note 14 - Senior Notes Payable (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Aug. 31, 2017
May 31, 2017
Apr. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Mar. 31, 2016
Proceeds from Issuance of Senior Long-term Debt     $ 225,000,000 $ 579,125,000 $ 300,000,000    
Repayments of Senior Debt       $ 483,000,000 $ 280,000,000    
1.625% Convertible Senior Notes due May 2018 [Member]              
Debt Instrument, Interest Rate, Stated Percentage       1.625% 1.625%   1.625%
Debt Instrument, Convertible, Conversion Ratio       31.8845      
Debt Instrument, Convertible Principal Amount used in Conversion Rate Calculation       $ 1,000      
Debt Instrument, Convertible, Conversion Price       $ 31.36      
0.25% Convertible Senior Notes Due June 2019 [Member]              
Debt Instrument, Interest Rate, Stated Percentage       0.25% 0.25%    
Debt Instrument, Convertible, Conversion Ratio       13.6157      
Debt Instrument, Convertible Principal Amount used in Conversion Rate Calculation       $ 1,000      
Debt Instrument, Convertible, Conversion Price       $ 73.44      
Debt Instrument, Convertible, Threshold Trading Days       20      
Debt Instrument, Convertible, Threshold Consecutive Trading Days       30      
Debt Instrument, Convertible, Condition of Redemption, Stock Price Threshold, Trading Period, Number of Trading Days, Number of Trading Days Immediately Preceding the Date On Which Notice of Redemption is Provided       5      
Debt Instrument, Convertible, Condition of Redemption, Stock Price Threshold       130.00%      
Debt Instrument, Redemption Price, Percentage       100.00%      
5.875% Senior Notes Due November 2024 [Member]              
Debt Instrument, Interest Rate, Stated Percentage     5.875%        
Proceeds from Issuance of Senior Long-term Debt     $ 125,000,000        
5.25% Senior Notes due June 2026 [Member]              
Debt Instrument, Interest Rate, Stated Percentage     5.25%        
Proceeds from Issuance of Senior Long-term Debt     $ 100,000,000        
8.4% Senior Notes Due May 2017 [Member]              
Debt Instrument, Interest Rate, Stated Percentage     8.40%        
Repayments of Senior Debt   $ 230,000,000          
5.00% Senior Notes Due 2027 [Member]              
Debt Instrument, Interest Rate, Stated Percentage           5.00%  
Debt Instrument, Face Amount           $ 350,000,000  
1.25% Convertible Senior Notes Due August 2032 [Member]              
Debt Instrument, Interest Rate, Stated Percentage 1.25%     1.25% 1.25%    
Debt Instrument, Redemption Price, Percentage 100.00%            
Repayments of Senior Debt $ 253,000,000