The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Acquisitions, Goodwill And Other Intangible Assets (Summary of Estimated Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Amortization expense	$ 23,758	$ 21,262	$ 19,573
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	33,356
2020	32,765
2021	32,407
2022	30,805
2023	29,604
Cost of Sales
Finite-Lived Intangible Assets
Amortization expense	5,200	5,350	5,631
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	4,469
2020	4,393
2021	4,180
2022	3,321
2023	2,566
Selling, General and Administrative Expenses
Finite-Lived Intangible Assets
Amortization expense	18,558	$ 15,912	$ 13,942
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	28,887
2020	28,372
2021	28,227
2022	27,484
2023	$ 27,038