Debt (Schedule Of Short-Term And Long-Term Balances Of Term Loan) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Dec. 01, 2017
Debt Instrument [Line Items]
Total loan balance	$ 319,113	$ 300,148
Less unamortized loan origination costs	(9,411)	(8,485)
Total loan balance	309,702	291,663
Less short-term loan balance	(1,652)	(1,195)
Long-term loan balance	308,050	290,468
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member]
Debt Instrument [Line Items]
Total loan balance	726	886
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]
Debt Instrument [Line Items]
Total loan balance	1,262	1,457
Term Loan [Member]
Debt Instrument [Line Items]
Total loan balance	217,125	218,250	$ 225,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total loan balance	$ 100,000	$ 79,555

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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