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Stock Compensation Plans (Restricted Stock Unit Award Transactions) (Details) - Restricted Stock Units (RSUs) [Member]
3 Months Ended
Mar. 31, 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 237,468
Shares awarded 110,404
Shares forfeited (4,635)
Shares earned (117,172)
Shares awarded but not earned, end of period 226,065