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Long-Term Debt - Financing Activity (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
shares
Long Term Debt              
Repayments of debt         $ 728,993,000 $ 625,924,000 $ 635,578,000
Convertible Debt              
Long Term Debt              
Stated interest rate             5.125%
Repayments of debt   $ 15,700,000          
Principal amount of debt converted             $ 271,800,000
Convertible debt rate, basis for conversion             58.4731
Conversion price per share (in dollars per share) | $ / shares             $ 17.10
Shares issued upon conversion | shares             15,893,457
5.125% senior notes due 2021              
Long Term Debt              
Debt Instrument, Face Amount $ 700,000,000   $ 700,000,000   $ 700,000,000    
Stated interest rate 5.125%   5.125%   5.125%    
6 3/8% Senior Notes, due 2022              
Long Term Debt              
Stated interest rate 6.375%   6.375%   6.375%    
5 1/4% Senior Notes due 2023              
Long Term Debt              
Stated interest rate 5.25%   5.25%   5.25%    
5.500% senior notes due 2024              
Long Term Debt              
Debt Instrument, Face Amount $ 500,000,000   $ 500,000,000   $ 500,000,000    
Stated interest rate 5.50%   5.50%   5.50%    
Senior Notes 5.000 Percent Due 2026 [Member]              
Long Term Debt              
Debt Instrument, Face Amount $ 400,000,000   $ 400,000,000   $ 400,000,000    
Stated interest rate 5.00%   5.00%   5.00%    
6 1/8% senior notes, due 2019              
Long Term Debt              
Debt Instrument, Face Amount $ 400,000,000   $ 400,000,000   $ 400,000,000    
Stated interest rate 6.125%   6.125%   6.125%    
Associated premiums and related expenses recorded     $ 16,500,000        
Redemption price of debt instrument (as a percent) 103.388%            
Repayments of debt $ 266,300,000            
7 5/8% senior notes, due 2020              
Long Term Debt              
Stated interest rate           7.625%  
Associated premiums and related expenses recorded       $ 16,700,000      
Redemption price of debt instrument (as a percent)           103.813%  
Repayments of debt       $ 350,000,000   $ 350,000,000,000  
Expenses recorded related to tender offer and early payoff of Senior Notes related to tender premiums, unamortized debt issuance cost write-off, and tender expenses           $ 16,700,000  
Senior Notes Due 2016 [Member]              
Long Term Debt              
Redemption price of debt instrument (as a percent) 103.063%            
Repayments of debt $ 133,700,000            
Senior term loan              
Long Term Debt              
Repayments of debt 228,100,000   $ 228,100,000        
Expenses recorded related to tender offer and early payoff of Senior Notes related to tender premiums, unamortized debt issuance cost write-off, and tender expenses $ 16,500,000