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Stock-Based Compensation Plans - Summary of Stock Options Outstanding (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 Years $ / shares shares | Dec. 31, 2017 Years $ / shares | Dec. 31, 2016 integer $ / shares
Shares under option | shares | 147,538 |  |
Weighted average exercise price | $ 33.48 | $ 28.70 | $ 25.35
Weighted average remaining life | 6.7 | 6.0 | 6.1
$16.71 - $24.75 Exercisable |  |  |
Shares under option | shares | 14,100 |  |
Weighted average exercise price | $ 16.71 |  |
Weighted average remaining life | Years | 2.9 |  |
$24.76 - $37.25 Exercisable |  |  |
Shares under option | shares | 32,753 |  |
Weighted average exercise price | $ 21.40 |  |
Weighted average remaining life | Years | 3.7 |  |
Minimum exercise price | $ 24.76 |  |
Maximum exercise price | $ 37.25 |  |
$37.26 - $45.97 Exercisable |  |  |
Shares under option | shares | 72,861 |  |
Weighted average exercise price | $ 39.04 |  |
Weighted average remaining life | Years | 7.8 |  |
Minimum exercise price | $ 37.26 |  |
Maximum exercise price | $ 45.97 |  |
$24.76 - $37.25 Non-exercisable |  |  |
Shares under option | shares | 3,542 |  |
Weighted average exercise price | $ 26.97 |  |
Weighted average remaining life | Years | 5.9 |  |
Minimum exercise price | $ 24.76 |  |
Maximum exercise price | $ 37.25 |  |
$37.26 - $45.97 Non-exercisable |  |  |
Shares under option | shares | 24,282 |  |
Weighted average exercise price | $ 43.74 |  |
Weighted average remaining life | Years | 9.5 |  |
Minimum exercise price | $ 37.26 |  |
Maximum exercise price | $ 45.97 |  |
Exercisable |  |  |
Shares under option | shares | 119,714 |  |
Weighted average exercise price | $ 31.59 |  |
Weighted average remaining life | Years | 6.1 |  |
Non-exercisable |  |  |
Shares under option | shares | 27,824 |  |
Weighted average exercise price | $ 41.61 |  |
Weighted average remaining life | Years | 9.0 |  |
$16.51 - $24.75 Exercisable |  |  |
Minimum exercise price | $ 16.51 |  |
Maximum exercise price | $ 24.75 |  |

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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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