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Stock Plans and Stock Based Compensation (Details 4)	12 Months Ended
	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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The weighted average exercise price of share-based awards forfeited during the period.

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The weighted average exercise price of share-based awards granted during the period.

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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

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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

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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

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+ 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

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