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Shareholders' Equity - Share-based Compensation, Stock Option Activity (Details) - ACS Member - Stock Options [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options issued and outstanding 3,119 6,115  
Awards, Stock Options, Number of Shares [Roll Forward]      
Outstanding at January 1, Shares 6,115 14,199 33,732
Granted, Shares 0 0 0
Cancelled/expired, Shares (405) (215) (1,298)
Exercised, Shares (2,591) (7,869) (18,235)
Outstanding at December 31, Shares 3,119 6,115 14,199
Exercisable, Shares 3,119 6,115 12,164
Awards, Stock Options, Weighted Average Exercise Price [Roll Forward]      
Outstanding at January 1, Weighted Average $ 7.00 $ 6.95 $ 6.86
Granted, Weighted Average 0.00 0.00 0.00
Cancelled/expired, Weighted Average 7.43 6.95 6.53
Exercised, Weighted Average 7.09 6.92 6.82
Outstanding at December 31, Weighted Average 6.87 7.00 6.95
Exercisable, Weighted Average $ 6.87 $ 7.00 $ 7.06