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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Business Acquisition (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 20, 2019	Mar. 20, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Increase (decrease) in contract with customer, asset			$ 7,923	$ 9,605	$ 27,932	$ 6,558
Increase (decrease) in accrued liabilities			2,838	$ 3,407	(8,063)	$ (8,762)
Finite-lived intangible assets, period increase (decrease)					329
Goodwill			$ 184,287		184,287		$ 180,934
CirComp GmbH [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 32,400
Other payments to acquire businesses	5,500
Amount of agreed to purchase primary operating facility		$ 5,800
Increase (decrease) in contract with customer, asset					(300)
Increase (decrease) in accrued liabilities					500
Finite-lived intangible assets, period increase (decrease)					300
Increase (decrease) in deferred income taxes					(200)
Goodwill, period increase (decrease)					$ 300
Goodwill	$ 17,676