Business Acquisition (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 20, 2020	Nov. 20, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Increase (decrease) in contract with customer, asset			$ 11,169	$ (3,528)	$ 20,009	$ (3,047)
Increase (decrease) in accrued liabilities			4,171	$ (1,074)	(10,901)	$ (12,169)
Finite-lived intangible assets, period increase (decrease)					329
Goodwill			$ 181,302		$ 181,302		$ 180,934
CirComp GmbH [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross		$ 32,400
Other payments to acquire businesses		$ 5,500
Period of equal installments		5 years
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