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Background and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 29, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017		Sep. 30, 2017	[1]	Jul. 01, 2017	[1]	Apr. 01, 2017	[1]	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019	Jan. 01, 2018
Summary of Significant Accounting Policies [Line Items]
Minimum ownership of fully controlled entities	100.00%																100.00%
Research and development expense																	$ 11,800	$ 11,700	$ 11,100
Recognized tax benefit to be realized upon ultimate settlement																	greater than 50 percent likely to be realized
Tax Cuts And Jobs Act Of 2017, income tax benefit	$ 800																	(2,200)
Allowance for doubtful accounts	500								$ 600								$ 500	600
Bad debt expense																	0	100	200
Depreciation expense																	8,900	8,700	9,300
Goodwill, impairment																	2,500
Other (expense) income - net																	(3,234)	(1,925)	(1,660)
Operating income (loss)	$ 7,091	[1]	$ 10,631		$ 11,315		$ 8,186		7,160	[1]	$ 5,530		$ 5,853		$ 3,945		37,223	22,488	11,267
Accounting Standards Update 2016-16
Summary of Significant Accounting Policies [Line Items]
Cumulative effect adjustment for adoption of ASU 2016-16									$ (153)									(153)
Accounting Standards Update 2017-04
Summary of Significant Accounting Policies [Line Items]
Goodwill, impairment																	2,500
Accounting Standards Update 2017-07
Summary of Significant Accounting Policies [Line Items]
Other (expense) income - net																	$ 1,700	900	600
Operating income (loss)																		(900)	(600)
Minimum | Patents and acquired technology
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life (in years)																	7 years
Minimum | Customer relationships
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life (in years)																	5 years
Minimum | Trade names
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life (in years)																	7 years
Minimum | Non-competition agreements
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life (in years)																	5 years
Maximum | Patents and acquired technology
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life (in years)																	20 years
Maximum | Customer relationships
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life (in years)																	15 years
Maximum | Trade names
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life (in years)																	10 years
Maximum | Non-competition agreements
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life (in years)																	10 years
Machinery and Equipment | Minimum
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)																	7 years
Machinery and Equipment | Maximum
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)																	10 years
Building and Building Improvements | Minimum
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)																	20 years
Building and Building Improvements | Maximum
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)																	40 years
Software
Summary of Significant Accounting Policies [Line Items]
Depreciation expense																	$ 500	$ 500	$ 600
Software | Minimum
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)																	3 years
Software | Maximum
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)																	5 years
Retained Earnings | Accounting Standards Update 2016-16
Summary of Significant Accounting Policies [Line Items]
Cumulative effect adjustment for adoption of ASU 2016-16																					$ 200
Subsequent Event | Minimum | Accounting Standards Update 2016-02
Summary of Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset																				$ 10,500
Operating lease, liability																				10,500
Subsequent Event | Maximum | Accounting Standards Update 2016-02
Summary of Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset																				11,500
Operating lease, liability																				$ 11,500
[1] The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2018 ended on March 31, June 30, September 29, and December 31, respectively. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively.

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