Business Acquisition (Schedule of Allocation of Purchase Price) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Nov. 20, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets acquired
Goodwill	$ 180,934	$ 17,300	$ 164,382	$ 166,796
CirComp GmbH [Member]
Assets acquired
Cash		1,607
Accounts receivable		986
Contract assets		2,269
Inventories		525
Prepaid expenses and other current assets		452
Right of use assets		5,686
Property, plant and equipment		4,884
Amortizable intangibles (see Note 15)		9,973
Goodwill		17,343
Total assets acquired		43,725
Liabilities assumed
Accounts payable		65
Accrued liabilities		2,249
Lease liabilities		502
Deferred income taxes		3,325
Other noncurrent liabilities		5,184
Total liabilities assumed		11,325
Net assets acquired		32,400
Purchase of business, net of cash acquired		$ 30,793