Business Acquisitions Schedule of Finite-Lived Intangible Assets (Tables) - USD ($)
$ in Thousands

12 Months Ended

May 15, 2017

Mar. 11, 2016

Dec. 31, 2017

Acquired Finite-Lived Intangible Assets [Line Items]

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

The following table summarizes the carrying amounts and weighted average lives of the acquired intangible assets:



	Carrying Value		Weighted Average Amortization Period (in years)
Developed technology	$	7,581	15.0
Customer relationships	937		10.0
Other	624		3.0
Total	$	9,142	13.7

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

On May 15, 2017, we acquired 100% of the equity interests in Noliac A/S, a privately-held company, for $19.3 million in cash. Noliac A/S is a designer and manufacturer of tape cast and bulk piezoelectric material as well as transducers for use in the telecommunications, industrial, medical, and defense industries. This acquisition will enable us to increase our product base within our ceramics product lines as well as expand our presence in the European market.

The purchase price of $19,121, net of cash acquired of $199, has been allocated to the assets acquired and liabilities assumed on the acquisition date based on their fair values.

The following table summarizes the fair values of the assets acquired and the liabilities assumed at the date of acquisition:



	Fair Values at May 15, 2017
Current assets	$	2,836
Property, plant and equipment	580
Other assets	395
Goodwill	9,313
Intangible assets	9,142
Fair value of assets acquired	22,266
Less fair value of liabilities acquired	(3,145		)
Net cash paid	$	19,121

Fair Value

$ 9,142

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

13 years 8 months

Noliac A/S [Member] | Developed Technology

Acquired Finite-Lived Intangible Assets [Line Items]

Fair Value

$ 7,581

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

15 years

Noliac A/S [Member] | Customer Relationships and Contracts

Acquired Finite-Lived Intangible Assets [Line Items]

Fair Value

$ 937

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

10 years

Noliac A/S [Member] | Other Intangible Assets

Acquired Finite-Lived Intangible Assets [Line Items]

Fair Value

$ 624

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

3 years

CTG Advanced Materials, LLC [Member]

Acquired Finite-Lived Intangible Assets [Line Items]

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

The following table summarizes the carrying amounts and weighted average lives of the acquired intangible assets:



	Carrying Value		Weighted Average Amortization Period (in years)
Developed technology	$	23,730	15.0
Customer relationships and contracts	11,502		14.6
Other	195		0.8
Total	$	35,427	14.8

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

On March 11, 2016, we acquired all of the outstanding membership interests in CTG Advanced Materials, LLC (“CTG-AM”), a privately-held company, for $73 million in cash plus a working capital adjustment. CTG-AM, formerly operated as H.C. Materials, is the market leading designer and manufacturer of single crystal piezoelectric materials, serving major original equipment manufacturers throughout the medical marketplace. These materials enable high definition ultrasound imaging (3D and 4D), as well as intravascular ultrasound applications. Other applications for these materials include wireless pacemakers, implantable hearing aids, and defense technologies.

With the CTG-AM acquisition, we gained technology and proprietary manufacturing methods that expand our offering of piezoelectric materials. This allows us to become the leading large-scale commercial producer of both single crystal materials and traditional piezoelectric ceramics.

The purchase price of $73,063, net of cash acquired of $4, has been allocated to the fair values of assets and liabilities acquired as of March 11, 2016.

The following table summarizes the fair values of the assets acquired and the liabilities assumed at the date of acquisition:



	Fair Values at March 11, 2016
Current assets	$	4,215
Property, plant and equipment	6,173
Other assets	37
Goodwill	27,879
Intangible assets	35,427
Fair value of assets acquired	73,731
Less fair value of liabilities acquired	(668		)
Net cash paid	$	73,063

Goodwill recorded in connection with this acquisition represents the value we expect to be created by combining the operations of the acquired business with our existing operations, including the expansion into markets within our existing business, access to new customers, and potential cost savings and synergies. Goodwill related to this acquisition is expected to be deductible for tax purposes.

Fair Value

$ 35,427

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

14 years 9 months 20 days

CTG Advanced Materials, LLC [Member] | Developed Technology

Acquired Finite-Lived Intangible Assets [Line Items]

Fair Value

$ 23,730

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

15 years

CTG Advanced Materials, LLC [Member] | Customer Relationships and Contracts

Acquired Finite-Lived Intangible Assets [Line Items]