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Long-Term Debt (Debt Instrument) (Details)
12 Months Ended
Oct. 11, 2019
USD ($)
Apr. 28, 2015
USD ($)
Mar. 27, 2015
USD ($)
Mar. 31, 2014
USD ($)
Nov. 26, 2013
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Long Term Debt Textual [Abstract]                
Repayments of borrowings — senior notes           $ 898,500,000 $ 400,000,000 $ 0
Debt extinguishment costs           $ (2,200,000) $ (58,800,000) $ 0
11.00% Notes                
Long Term Debt Textual [Abstract]                
Senior Notes, Issuance Date Oct. 11, 2019              
Senior Notes Issued, Gross $ 550,000,000.0              
Senior Notes, Maturity date Apr. 15, 2025              
Proceeds from debt $ 539,900,000              
Interest and principal payments of debt instruments semiannually              
7.75% Notes                
Long Term Debt Textual [Abstract]                
Senior Notes, Issuance Date     Mar. 27, 2015          
Senior Notes Issued, Gross     $ 325,000,000          
Senior Notes, Maturity date     Apr. 15, 2023          
Debt Instrument Percentage of Discount Price     99.257%          
Proceeds from debt     $ 317,000,000          
Interest and principal payments of debt instruments     semiannually          
6.50% Notes                
Long Term Debt Textual [Abstract]                
Senior Notes, Issuance Date       Mar. 31, 2014        
Senior Notes Issued, Gross       $ 900,000,000        
Senior Notes, Maturity date       Apr. 15, 2021        
Proceeds from debt       $ 884,000,000        
Repayments of borrowings — senior notes $ 761,200,000              
Interest and principal payments of debt instruments       semiannually        
9.375% Notes                
Long Term Debt Textual [Abstract]                
Repayments of borrowings — senior notes       $ 500,000,000 $ 100,000,000      
7.625% Notes                
Long Term Debt Textual [Abstract]                
Senior Notes, Issuance Date         Nov. 26, 2013      
Senior Notes Issued, Gross         $ 350,000,000      
Senior Notes, Maturity date         Jan. 15, 2022      
Debt Instrument Percentage of Discount Price         98.494%      
Proceeds from debt         $ 337,400,000      
Interest and principal payments of debt instruments         semiannually      
9.625% Notes                
Long Term Debt Textual [Abstract]                
Repayments of borrowings — senior notes   $ 178,800,000            
Senior Notes [Member] | Maximum                
Long Term Debt Textual [Abstract]                
Fixed Charge Coverage Ratio           2.25462620281273