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Stock Compensation Plans (Restricted Stock Unit Award Transactions) (Details) - Restricted Stock Units (RSUs) [Member]
9 Months Ended
Sep. 30, 2017
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 222,730
Shares awarded 111,166
Shares forfeited or unearned (7,107)
Shares earned (88,645)
Shares awarded but not earned, end of period 238,144