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Product warranty term.

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Significant accounting policies.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 10, 2017
Significant Accounting Policies [Line Items]
Earnings from equity investment			$ 104	$ 2,191	$ 2,657
Cash dividend received				2,341
Gain on sale of facilities			(36)	1,707	(1)
ASU 2016-15 \| Payments of Contingent Considerations Reported As Cash Used in Financing Activities
Significant Accounting Policies [Line Items]
Impact on consolidated financial statements upon adoption of new accounting standard update			2,500
ASU 2016-16 \| Expected Reduction in Total Assets and Equity \| Scenario, Forecast
Significant Accounting Policies [Line Items]
Impact on consolidated financial statements upon adoption of new accounting standard update		$ 2,600
Restructuring, Acquisition and Divestiture Related Costs \| Facility Closing
Significant Accounting Policies [Line Items]
Gain on sale of facilities				1,700
Laser Quantum
Significant Accounting Policies [Line Items]
Percentage of additional shares acquired						35.00%
Earnings from equity investment			$ 100	2,200	$ 2,700
Net investment				$ 8,500
Cash dividend received	$ 2,300
Maximum
Significant Accounting Policies [Line Items]
Cash equivalents original maturity period			3 months
Maximum \| Photonics
Significant Accounting Policies [Line Items]
Standard warranty period			24 months
Maximum \| Precision Motion
Significant Accounting Policies [Line Items]
Standard warranty period			24 months
Maximum \| Vision
Significant Accounting Policies [Line Items]
Standard warranty period			36 months
Maximum \| Buildings and improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives			30 years
Maximum \| Machinery and Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives			10 years
Minimum \| Photonics
Significant Accounting Policies [Line Items]
Standard warranty period			12 months
Minimum \| Precision Motion
Significant Accounting Policies [Line Items]
Standard warranty period			12 months
Minimum \| Vision
Significant Accounting Policies [Line Items]
Standard warranty period			12 months
Minimum \| Buildings and improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives			3 years
Minimum \| Machinery and Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives			3 years