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Share-Based Compensation (PSUs Vested and Converted) (Details) - PSUs - 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]      
Vested during the year 161 85 0
Award converted during the year, net of shares withheld for taxes 96 287 0
Shares withheld for taxes 65 141 0