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Debt (Schedule Of Short-Term And Long-Term Balances Of Term Loan) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 01, 2017	Jun. 30, 2015
Debt Instrument [Line Items]
Total loan balance	$ 319,789	$ 300,148
Less unamortized loan origination costs	(8,557)	(8,485)
Total loan balance	311,232	291,663
Less short-term loan balance	(1,174)	(1,195)
Long-term loan balance	310,058	290,468
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member]
Debt Instrument [Line Items]
Total loan balance	782	886
Interest rate on amounts borrowed				2.45%
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]
Debt Instrument [Line Items]
Total loan balance	1,319	1,457
Interest rate on amounts borrowed				1.40%
Term Loan [Member]
Debt Instrument [Line Items]
Total loan balance	217,688	218,250	$ 225,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total loan balance	$ 100,000	$ 79,555