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Share-Based Compensation Plans (Narrative) (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2018
$ / shares
shares
Feb. 28, 2018
$ / shares
shares
Mar. 31, 2015
$ / shares
shares
Apr. 30, 2012
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted-average grant-date fair value per share (in dollars per share) | $ / shares         $ 1.04 $ 1.54 $ 1.37  
Unrecognized compensation cost | $         $ 6,100,000      
Unrecognized compensation costs, recognized over a weighted average period         1 year 9 months 18 days      
Compensation cost for share-based payments | $         $ 13,800,000 $ 24,200,000 $ 24,000,000  
Employee Stock Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years         3 years      
Contractual term, years         10 years      
Options, grant date premium on exercise price           25.00% 30.00%  
Restricted Stock Units (RSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years         3 years      
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares         $ 4.45      
Fair value vested during period | $         $ 7,200,000      
Granted (in shares)         2,433,000      
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares         $ 2.61      
Vested (in shares)         1,705,000      
Nonvested, ending balance (in shares)         4,998,000 4,804,000    
Restricted Stock Units (RSUs) | Director                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years         1 year      
Performance Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years         3 years      
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares         $ 5.93      
Granted (in shares)         1,301,000      
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares         $ 2.93      
Vested (in shares)         986,000      
Nonvested, ending balance (in shares)         3,177,000 4,356,000    
Restricted Stock Units and Performance Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation costs, recognized over a weighted average period         1 year 8 months 12 days      
Unrecognized compensation cost | $         $ 9,500,000      
Restricted Stock Units - Treasury Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation cost | $         0      
Compensation cost for share-based payments | $         $ 100,000 $ 800,000 $ 1,700,000  
Vested (in shares)         163,198      
Nonvested, ending balance (in shares)         0      
2018 | Performance Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares         $ 2.63      
2018 | Restricted Stock Units - Treasury Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years   3 years            
Unrecognized compensation cost | $         $ 900,000.0      
Granted (in shares)   600,000            
Compensation cost for share-based payments | $         $ 400,000.0      
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares   $ 2.25            
Vested (in shares)         0      
Nonvested, ending balance (in shares)         600,000      
2018 | Performance Restricted Stock Units - Treasury Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years 3 years              
Performance period 1 year              
Unrecognized compensation cost | $         $ 400,000.0      
Granted (in shares) 200,000              
Compensation cost for share-based payments | $         $ 100,000.0      
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 2.79              
Vested (in shares)         121,951      
Nonvested, ending balance (in shares)         200,000      
2017 | Performance Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years         3 years      
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares           $ 4.52    
2016 | Performance Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years         3 years      
Performance period         3 years      
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares             $ 4.42  
2015 | Performance Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares               $ 7.49
2015 | Restricted Stock Units - Treasury Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years     3 years          
Granted (in shares)     489,596          
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares     $ 9.00          
2015 | Performance Restricted Stock Units - Treasury Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)     121,951          
Compensation cost for share-based payments | $         $ 0.0 $ 100,000.0 $ 100,000.0  
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares     $ 7.49          
Late 2015 | Performance Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)             1,123,183  
Compensation cost for share-based payments | $             $ 2,000,000  
2012 | Restricted Stock Units - Treasury Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period, years       5 years        
Granted (in shares)       200,000        
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares       $ 21.69        
2013 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum award (in shares)         55,000,000      
Multiplier for grant award         3.13      
2016 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum award (in shares)         48,000,000      
Multiplier for grant award         2.4