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Stock-Based Compensation Plans (Performance Stock Units) (Details) - Performance Stock Units - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Shares    
Units outstanding beginning (in shares) 606,715 0
Granted (in shares) 725,330 493,255
Performance adjustments (in shares) (188,774) 113,460
Forfeited (in shares) (35,756) 0
Units outstanding ending (in shares) 1,107,515 606,715