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Stock-Based Compensation Plans (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Remaining Contractual Life (Years), Outstanding - June 30, 2017 3 years 1 month 6 days
Weighted Average Remaining Contractual Life (Years), Exercisable - June 30, 2017 2 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding at June 30, 2017 | $ $ 2,748,000 [1]
Aggregate Intrinsic Value, Exercisable at June 30, 2017 | $ $ 1,501,000 [1]
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at beginning of year | shares 1,486,257
Shares, Exercised | shares (16,888)
Shares, Forfeited or expired | shares (6,125)
Shares, Outstanding at end of year | shares 1,463,244
Shares, Exercisable at end of year | shares 750,344
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ / shares $ 26.13
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares 25.96
Weighted Average Exercise Price, Forfeited or expired (in dollars per share) | $ / shares 26.32
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | $ / shares 26.13
Weighted Average Exercise Price, Exercisable at end of year (in dollars per share) | $ / shares $ 26.07
[1] The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of the Company's stock on June 30, 2017 of $27.88 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.