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Debt (Schedule Of Short-Term And Long-Term Balances Of Term Loan) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Dec. 01, 2017
Debt Instrument [Line Items]      
Total loan balance $ 316,902 $ 317,627  
Less unamortized loan origination costs (8,048) (8,504)  
Total loan balance 308,854 309,123  
Less short-term loan balance, net (1,622) (1,630)  
Long-term loan balance, net 307,232 307,493  
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member]      
Debt Instrument [Line Items]      
Total loan balance $ 493 566  
Interest rate on amounts borrowed 2.45%    
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]      
Debt Instrument [Line Items]      
Total loan balance $ 971 1,061  
Interest rate on amounts borrowed 1.40%    
Term Loan [Member]      
Debt Instrument [Line Items]      
Total loan balance $ 215,438 216,000 $ 225,000
Convertible Senior Notes [Member]      
Debt Instrument [Line Items]      
Total loan balance $ 100,000 $ 100,000