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Share-Based Compensation Plans (Schedule of Summary of Performance Restricted Stock Units) (Details) - Performance Restricted Stock Units [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Nonvested, beginning balance, restricted stock and units | shares 4,922 [1]
Granted, restricted stock and units | shares 1,869
Vested, restricted stock and units | shares (1,478)
Forfeited, restricted stock and units | shares (957)
Nonvested, ending balance, restricted stock and units | shares 4,356 [1]
Nonvested, beginning balance, weighted-average grant- date fair value | $ / shares $ 8.99
Granted, weighted-average grant-date fair value | $ / shares 4.21
Vested, weighted-average grant-date fair value | $ / shares 14.69
Forfeited, weighted average grant-date fair value | $ / shares 6.68
Nonvested, ending balance, weighted-average grant-date fair value | $ / shares $ 5.50
[1] Based on initial target payout.