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Stock Compensation Plans (Performance Award Transactions) (Details) - Performance Awards
9 Months Ended
Sep. 30, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]  
Shares awarded but not earned, beginning of period (in shares) 1,645,078
Shares awarded (in shares) 441,740
Shares forfeited (in shares) (63,874)
Shares earned (in shares) 0
Shares awarded but not earned, end of period (in shares) 2,022,944