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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)
12 Months Ended
Apr. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Available for Grant   4,045,492  
Nonvested Awards, Compensation Cost Not yet Recognized   $ 1,500,000  
Share Price   $ 0.03  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period   3 years  
Award Expiration Period   10 years  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period   1 year  
Awards granted   729,112  
Weighted average grant date awards granted, fair value   $ 0.73 $ 5.85
Restricted Stock Units (RSUs) [Member] | Time-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period   3 years  
Awards granted   870,648  
Weighted average grant date awards granted, fair value   $ 1.38 $ 3.85
Restricted Stock Units (RSUs) [Member] | Performance-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period   39 months  
Award Performance Period   3 years  
Awards granted   0  
Weighted average grant date awards granted, fair value   $ 0.00  
Restricted Stock Units (RSUs) [Member] | Performance-Based RSUs, 2017 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Award, Estimated Achievement Level, Percentage   75.00%  
Phantom Share Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Award, Estimated Achievement Level, Percentage   50.00%  
Sensitivity Analysis of Fair Value, Change in Compensation Cost Due to Change in Assumption, Impact of $1 Increase in Price of Common Stock   $ 1,400,000  
Phantom Share Units (PSUs) [Member] | Phantom Share Units, 2016 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Award, Actual Achievement Level, Percentage 175.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid $ 3,500,000    
Performance-based phantom stock unit awards [Member] | Phantom Share Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period   39 months  
Award Performance Period   3 years  
Performance-based phantom stock unit awards [Member] | Phantom Share Units (PSUs) [Member] | Phantom Stock Units, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted   2,467,776  
Weighted average grant date awards granted, fair value   $ 1.10  
Performance-based phantom stock unit awards [Member] | Phantom Share Units (PSUs) [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
Performance-based phantom stock unit awards [Member] | Maximum [Member] | Phantom Share Units (PSUs) [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  
Performance-based phantom stock unit awards [Member] | Maximum [Member] | Phantom Share Units (PSUs) [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
Time-based phantom stock unit awards [Member] | Phantom Share Units (PSUs) [Member] | Phantom Stock Units, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period   3 years  
Awards granted   810,648  
Weighted average grant date awards granted, fair value   $ 1.17  
Time-based phantom stock unit awards [Member] | Phantom Share Units (PSUs) [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
Time-based phantom stock unit awards [Member] | Maximum [Member] | Phantom Share Units (PSUs) [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  
Time-based phantom stock unit awards [Member] | Maximum [Member] | Phantom Share Units (PSUs) [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