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Stock Plans and Stock Based Compensation (Details 4) | 12 Months Ended
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Dec. 31, 2016 $ / shares shares
Number of Shares |
Unvested, December 31, 2016 (in shares) | shares | 247,347
Granted (in shares) | shares | 53,770
Vested (in shares) | shares | (36,030)
Forfeited (in shares) | shares | (13,371)
Unvested, December 31, 2016 (in shares) | shares | 251,716
Weighted Average Exercise Price |
December 31, 2016 (in USD per share) | $ / shares | $ 47.57
Granted (in USD per share) | $ / shares | 76.93
Vested (in USD per share) | $ / shares | 73.99
Forfeited (in USD per share) | $ / shares | 46.88
December 31, 2016 (in USD per share) | $ / shares | $ 54.46

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- Definition The weighted average exercise price of share-based awards forfeited during the period. + References No definition available. + Details
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- Definition The weighted average exercise price of share-based awards granted during the period. + References No definition available. + Details
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- Definition The weighted average exercise price of nonvested share-based awards. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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