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Stock Compensation Plans (Performance Award Transactions) (Details) - Performance Shares [Member]
6 Months Ended
Jun. 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 1,645,078
Shares awarded 441,740
Shares forfeited (42,900)
Shares earned 0
Shares awarded but not earned, end of period 2,043,918