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Stock-Based Compensation Plans (Schedule of Phantom Stock Unit Activity) (Details) - Phantom Share Units (PSUs) [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Performance-based phantom stock unit awards [Member] | Phantom Stock Units, 2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted 0 0 2,467,776  
Weighted average grant date awards granted, fair value     $ 1.10  
Performance-based phantom stock unit awards [Member] | Phantom Stock Units, 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted       1,188,216
Weighted average grant date awards granted, fair value       $ 3.06
Time-based phantom stock unit awards [Member] | Phantom Stock Units, 2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted     810,648  
Weighted average grant date awards granted, fair value     $ 1.17  
Time-based phantom stock unit awards [Member] | Phantom Stock Units, 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted       0
Weighted average grant date awards granted, fair value       $ 0.00
Maximum [Member] | Performance-based phantom stock unit awards [Member] | Phantom Stock Units, 2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Award, Maximum Cash Value of Phantom Stock Unit Awards     $ 4.62  
Maximum [Member] | Performance-based phantom stock unit awards [Member] | Phantom Stock Units, 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Award, Maximum Cash Value of Phantom Stock Unit Awards       $ 9.66
Maximum [Member] | Time-based phantom stock unit awards [Member] | Phantom Stock Units, 2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Award, Maximum Cash Value of Phantom Stock Unit Awards     $ 4.62  
Maximum [Member] | Time-based phantom stock unit awards [Member] | Phantom Stock Units, 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Award, Maximum Cash Value of Phantom Stock Unit Awards       $ 0.00