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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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