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Long-Term Debt - Financing Activity (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Long Term Debt            
Repayments of debt       $ 455,491,000 $ 609,914,000 $ 728,993,000
5.125% senior notes due 2021            
Long Term Debt            
Stated interest rate       5.125%    
6 3/8% Senior Notes, due 2022            
Long Term Debt            
Stated interest rate       6.375%    
Redemption price of debt instrument (as a percent) 103.188% 103.563%        
Debt Instrument, Repurchased Face Amount $ 167,100,000 $ 182,900,000        
5 1/4% Senior Notes due 2023            
Long Term Debt            
Stated interest rate       5.25%    
5.500% senior notes due 2024            
Long Term Debt            
Stated interest rate       5.50%    
Senior Notes 5.000 Percent Due 2026 [Member]            
Long Term Debt            
Debt Instrument, Face Amount       $ 400,000,000    
Stated interest rate       5.00%    
6 1/8% senior notes, due 2019            
Long Term Debt            
Stated interest rate       6.125%    
Redemption price of debt instrument (as a percent)     103.388%      
Repayments of debt     $ 266,300,000      
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      
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      
4.125% Senior Note due 2025 [Member]            
Long Term Debt            
Debt Instrument, Face Amount   $ 350,000,000        
Stated interest rate   4.125%   4.125%    
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       $ 14,600,000