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Debt (Schedule Of Short-Term And Long-Term Balances Of Term Loan) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 01, 2017	Jun. 30, 2015
Debt Instrument [Line Items]
Total loan balance	$ 300,148	$ 223,176
Less unamortized loan origination costs	(8,485)	(7,441)
Total loan balance	291,663	215,735
Less short-term loan balance	(1,195)	(1,164)
Long-term loan balance	290,468	214,571
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member]
Debt Instrument [Line Items]
Total loan balance	$ 886	1,061
Interest rate on amounts borrowed	2.45%			2.45%
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]
Debt Instrument [Line Items]
Total loan balance	$ 1,457	1,615
Interest rate on amounts borrowed	1.40%			1.40%
Term Loan [Member]
Debt Instrument [Line Items]
Total loan balance	$ 218,250	$ 220,500	$ 225,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total loan balance	$ 79,555