The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The net result for the period of deducting operating expenses from operating revenues.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
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-SubTopic 20
-Section 50
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
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Segment Reporting - Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net sales to external customers	$ 91,698	$ 79,600	$ 78,538	$ 75,748	$ 91,327	$ 72,507	$ 83,775	$ 69,939	$ 325,584	$ 317,548	$ 341,826
Segment profit	$ 48,677	$ 42,678	$ 43,934	$ 42,671	$ 48,523	$ 34,766	$ 44,441	$ 39,506	177,960	167,236	188,510
General and administrative									40,813	36,370	35,331
Depreciation and amortization									13,868	11,217	7,428
Research and development									30,125	26,690	27,607
Income from operations									13,284	13,122	37,340
Operating Segments
Segment Reporting Information [Line Items]
Segment profit									98,090	87,399	107,706
Factory Metrology
Segment Reporting Information [Line Items]
Net sales to external customers									236,313	222,745	246,216
Factory Metrology \| Operating Segments
Segment Reporting Information [Line Items]
Segment profit									69,845	63,463	76,111
Construction BIM-CIM
Segment Reporting Information [Line Items]
Net sales to external customers									65,056	70,849	75,383
Construction BIM-CIM \| Operating Segments
Segment Reporting Information [Line Items]
Segment profit									18,250	16,299	24,497
Other
Segment Reporting Information [Line Items]
Net sales to external customers									24,215	23,954	20,227
Other \| Operating Segments
Segment Reporting Information [Line Items]
Segment profit									$ 9,995	$ 7,637	$ 7,098