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Share-Based Compensation Plans (Schedule of Summary of Restricted Stock and Restricted Stock Units) (Details) - Restricted Stock Units (RSUs)
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested, beginning balance (in shares) | shares 4,998
Granted (in shares) | shares 3,909
Vested (in shares) | shares (2,123)
Forfeited (in shares) | shares (902)
Modified (in shares) | shares (1,484)
Nonvested, ending balance (in shares) | shares 4,398
Nonvested, beginning balance, weighted-average grant- date fair value (in dollars per share) | $ / shares $ 3.37
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares 2.81
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares 3.30
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares 3.40
Modified, weighted average grant-date fair value (in dollars per share) | $ / shares 2.75
Nonvested, ending balance, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 3.11