Acquisition and Divestiture Activities (Details) - USD ($) $ in Thousands				12 Months Ended
	Jan. 03, 2019	Jun. 11, 2018	Feb. 08, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Acquisition of business, net of cash acquired				$ 11,862	$ 14,880	$ 0
Acquisition of noncontrolling interests						4,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill				$ 150,642	147,480	$ 142,742
Bi-Metallix [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business acquisition, effective date of acquisition				Jan. 03, 2019
Business acquisition, name of acquired entity	Bi-Metallix, Inc.
Acquisition of business, net of cash acquired	$ 11,862
Definite-lived intangible assets	2,900
Goodwill related to acquisitions	$ 3,324			$ 3,324
UltraSource [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business acquisition, effective date of acquisition				Feb. 08, 2018
Business acquisition, name of acquired entity			UltraSource, Inc.
Acquisition of business, net of cash acquired			$ 13,596
Definite-lived intangible assets			6,500
Goodwill related to acquisitions			$ 4,227		4,227
EuroPower [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business acquisition, effective date of acquisition				Jun. 11, 2018
Business acquisition, name of acquired entity		EuroPower Holdings Ltd.
Acquisition of business, net of cash acquired		$ 2,939
Goodwill related to acquisitions		$ 1,068			$ 1,068