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Long-Term Debt - Financing Activity (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 16, 2015
USD ($)
Jun. 16, 2014
USD ($)
Jun. 12, 2014
USD ($)
$ / shares
shares
Apr. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2015
Sep. 30, 2014
USD ($)
Jun. 15, 2014
Long Term Debt                      
Repayments of debt           $ 612,534 $ 635,578 $ 517,978      
6 3/4% senior notes, due 2015                      
Long Term Debt                      
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               $ 2,600      
Repayments of debt       $ 198,300 $ 301,700            
Stated interest rate (as a percent)         6.75%            
6 1/8% senior notes, due 2019                      
Long Term Debt                      
Stated interest rate (as a percent)           6.125% 6.125%        
7 5/8% senior notes, due 2020                      
Long Term Debt                      
Associated premiums and related expenses recorded $ 16,700                    
Redemption price of debt instrument (as a percent) 103.813%                    
Repayments of debt $ 350,000                    
Stated interest rate (as a percent)           7.625% 7.625%   7.625%    
5.125% senior notes due 2021                      
Long Term Debt                      
Debt issued                   $ 700,000  
Stated interest rate (as a percent)           5.125% 5.125%     5.125%  
6 3/8% Senior Notes, due 2022                      
Long Term Debt                      
Stated interest rate (as a percent)           6.375% 6.375%        
5 1/4% Senior Notes due 2023                      
Long Term Debt                      
Debt issued         $ 400,000            
Stated interest rate (as a percent)         5.25% 5.25% 5.25%        
5.500% senior notes due 2024                      
Long Term Debt                      
Debt issued                   $ 500,000  
Stated interest rate (as a percent)           5.50% 5.50%     5.50%  
5.125% convertible senior notes                      
Long Term Debt                      
Repayments of debt   $ 15,700                  
Stated interest rate (as a percent)     5.125%     5.125% 5.125% 5.125%     5.125%
Principal amount of debt converted     $ 271,800                
Convertible debt rate, basis for conversion     0.5847310                
Conversion price per share (in dollars per share) | $ / shares     $ 17.10                
Shares issued upon conversion | shares     15,893,457