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Product warranty term.

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Significant accounting policies.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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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Amount of the effect of a change in accounting principle on operating profit or loss.

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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	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Earnings from equity investment		$ 2,191	$ 2,657	$ 2,700
Cash dividend received		2,341
Gain on sale of facilities		1,707	$ (1)	$ (19)
Accounting standards update effect of change on operating results		100
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]
Equity method investment ownership percentage		41.00%	41.00%
Net investment		$ 8,500	$ 10,100
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