Debt (Schedule Of Short-Term And Long-Term Balances Of Term Loan) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Dec. 01, 2017
Debt Instrument [Line Items]
Total loan balance	$ 299,848	$ 223,176
Less unamortized loan origination costs	(8,986)	(7,441)
Total loan balance	290,862	215,735
Less short-term loan balance	(1,165)	(1,164)
Long-term loan balance	289,697	214,571
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member]
Debt Instrument [Line Items]
Total loan balance	911	1,061
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]
Debt Instrument [Line Items]
Total loan balance	1,463	1,615
Term Loan [Member]
Debt Instrument [Line Items]
Total loan balance	218,812	$ 220,500	$ 225,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total loan balance	$ 78,662

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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