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Summary Of Significant Accounting Policies (Recent Developments) (Narrative) (Details) - USD ($)
12 Months Ended
Feb. 21, 2020
Dec. 31, 2019
Dec. 31, 2017
Feb. 24, 2020
Ownership percent   100.00%    
Repayments of debt     $ 500,000,000  
Stock split, conversion ratio   0.10    
Unsecured Senior Notes Due 2021 [Member]        
Senior Notes   $ 800,000,000.0    
Stated interest rate   7.125%    
Unsecured Senior Notes Due 2021 [Member] | Subsequent Event [Member]        
Senior Notes       $ 182,100,000
New Notes [Member]        
Stated interest rate   7.125%    
New Notes [Member] | Subsequent Event [Member]        
Principal amount $ 617,900,000      
Percentage of new principal as a percentage of original notes 77.24%      
New Notes [Member] | Maximum [Member]        
Principal amount   $ 635,000,000.0    
Newco [Member] | Newco Secured Notes [Member]        
Principal amount   $ 243,300,000    
Stated interest rate   9.75%    
Repayments of debt   $ 131,300,000    
Debt consent payment   6,350,000    
Newco [Member] | Superior Secured Notes [Member]        
Principal amount   $ 243,300,000    
Stated interest rate   8.75%    
Newco [Member] | Scenario, Plan [Member]        
Equity interest acquired   65.00%    
Value of stock issued for debt   $ 30,000,000.0    
Preferred stock dividend rate   5.00%    
Ownership percent   52.00%    
Common Class A [Member] | Newco [Member] | Scenario, Plan [Member]        
Equity interest acquired   49.90%    
Common Class B [Member] | Newco [Member] | Scenario, Plan [Member]        
Equity interest acquired   100.00%    
Forbes [Member] | Newco [Member] | Scenario, Plan [Member]        
Ownership percent   48.00%