Net Income Per Common Share (Reconciliation of Basic and Diluted Weighted Average Shares) (Details) - shares	3 Months Ended	9 Months Ended
Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	29,876,468	29,478,243	29,794,091	29,332,508
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees	350,842	684,045	270,776	507,508
Common stock issuable upon the exercise of stock options and share appreciation rights (SARs)	2,343,432	2,431,071	2,348,248	2,374,403
Dilutive weighted average common shares outstanding	32,570,742	32,593,359	32,413,115	32,214,419

The sum of dilutive potential unvested restricted stock units and common stock subject to vesting requirements used in the calculation of the diluted per-share or per-unit computation.

No definition available.

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- Definition

The sum of dilutive potential stock options and stock appreciation rights used in the calculation of the diluted per-share or per-unit computation.

+ References

No definition available.

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- References

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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