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Shareholders' Equity (Restricted Shares and RSUs Activity Roll Forward) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Restricted Shares/Units [Member]  
Nonvested at beginning of period | shares 12,075
Granted | shares 3,772
Vested | shares (3,703)
Forfeited | shares (320)
Nonvested at end of period | shares 11,824
Expected to vest at end of period | shares 10,853
Wtd Avg Grant Date Fair Value [Member]  
Nonvested at beginning of period | $ / shares $ 27.38
Granted | $ / shares 33.27
Vested | $ / shares 25.29
Forfeited | $ / shares 31.24
Nonvested at end of period | $ / shares 29.81
Expected to vest at end of period | $ / shares $ 29.81