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Stock-Based Compensation Plans (Performance Stock Units) (Details) - Performance Stock Units - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Shares    
Units outstanding beginning (in shares) 1,107,515 606,715
Granted (in shares) 889,599 725,330
Performance adjustments (in shares) (1,400,425) (188,774)
Forfeited (in shares) (216,791) (35,756)
Units outstanding ending (in shares) 379,898 1,107,515