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Stock Compensation Plans (Restricted Stock Unit Award Transactions) (Details) - Restricted Stock Units (RSUs) [Member]
6 Months Ended
Jun. 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 108,588
Shares forfeited or unearned (7,107)
Shares earned (86,783)
Shares awarded but not earned, end of period 237,428