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Stock-Based Compensation Plans (Performance Stock Units) (Details) - Performance Stock Units - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares    
Units outstanding beginning (in shares) 379,898 1,107,515
Granted (in shares) 1,073,934 889,599
Performance adjustments (in shares) (226,154) (1,400,425)
Forfeited (in shares) (82,653) (216,791)
Units outstanding ending (in shares) 1,145,025 379,898