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Debt (Schedule Of Short-Term And Long-Term Balances Of Term Loan) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 01, 2017
Debt Instrument [Line Items]
Term loan balance	$ 225,076	$ 225,953
Less unamortized loan origination costs	(8,663)	(9,072)
Net borrowings	216,413	216,881
Less short-term loan balance	(1,153)	(1,160)
Long-term loan balance	215,260	215,721
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member]
Debt Instrument [Line Items]
Term loan balance	1,683	1,318
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]
Debt Instrument [Line Items]
Term loan balance	1,206	1,885
Term Loan [Member]
Debt Instrument [Line Items]
Term loan balance	$ 222,187	$ 222,750	$ 225,000

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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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