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Note 14 - Senior Notes Payable (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
May 31, 2017
Apr. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Proceeds from Issuance of Senior Long-term Debt   $ 225,000,000 $ 579,125,000 $ 300,000,000  
Repayments of Senior Debt     $ 230,000,000  
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     31.8753    
Debt Instrument, Convertible Principal Amount used in Conversion Rate Calculation     $ 1,000    
Debt Instrument, Convertible, Conversion Price     $ 31.37    
0.25% Convertible Senior Notes Due June 2019 [Member]          
Debt Instrument, Interest Rate, Stated Percentage     0.25% 0.25%  
Debt Instrument, Convertible, Conversion Ratio     13.6118    
Debt Instrument, Convertible Principal Amount used in Conversion Rate Calculation     $ 1,000    
Debt Instrument, Convertible, Conversion Price     $ 73.47    
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%    
1.25% Convertible Senior Notes Due August 2032 [Member]          
Debt Instrument, Interest Rate, Stated Percentage     1.25% 1.25%  
Debt Instrument, Convertible, Conversion Ratio     24.9496    
Debt Instrument, Convertible Principal Amount used in Conversion Rate Calculation     $ 1,000    
Debt Instrument, Convertible, Conversion Price     $ 40.08    
Debt Instrument, Redemption Price, Percentage     100.00%    
5.875% Senior Notes Due November 2024 [Member]          
Proceeds from Issuance of Senior Long-term Debt   $ 125,000,000      
Debt Instrument, Interest Rate, Stated Percentage   5.875%      
5.25% Senior Notes due June 2026 [Member]          
Proceeds from Issuance of Senior Long-term Debt   $ 100,000,000      
Debt Instrument, Interest Rate, Stated Percentage   5.25%      
8.4% Senior Notes Due May 2017 [Member]          
Repayments of Senior Debt $ 230,000,000        
Debt Instrument, Interest Rate, Stated Percentage   8.40%      
5.00% Senior Notes Due 2027 [Member]          
Debt Instrument, Face Amount     $ 350,000,000    
Debt Instrument, Interest Rate, Stated Percentage     5.00%