Stock Compensation - Activity (Details) - $ / shares	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Options Activity
Options canceled (shares)	204,274	13,422	817,063	492,597
Forfeited (shares)	67,941	63,861	400,121	141,153
Options exercised (shares)	599,125	320,190	1,005,405	375,568
Options Weighted Average Exercise Price
Options granted, weighted average exercise price (usd per share)	$ 29.26	$ 32.79	$ 32.25	$ 27.73
Options forfeited, weighted average exercise price (usd per share)	15.37	16.29	18.02	14.58
Options exercised, weighted average exercise price (usd per share)	$ 16.94	$ 13.20	$ 15.22	$ 13.07
RSUs \| Non-employee directors
Equity Awards Other Than Options
Equity instruments granted (shares)	26,523	0	341,983	21,198
Equity instruments granted, weighted average exercise price (usd per share)	$ 29.03	$ 0	$ 31.62	$ 31.13
RSUs \| Employee
Equity Awards Other Than Options
Equity instruments granted (shares)	145,259	6,659	268,390	146,102
Equity instruments granted, weighted average exercise price (usd per share)	$ 29.04	$ 31.95	$ 31.48	$ 27.79
PSU's \| Employee
Equity Awards Other Than Options
Equity instruments granted (shares)	84,226	0	193,763	0
Equity instruments granted, weighted average exercise price (usd per share)	$ 29.38	$ 0	$ 31.60	$ 0

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).

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=96867065&loc=d3e5070-113901

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Gross number of share options (or share units) granted during the period.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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