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, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Amortization expense	$ 37,873	$ 23,758	$ 21,262
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	41,499
2020	40,661
2021	39,583
2022	38,110
2023	34,909
Cost of Sales
Finite-Lived Intangible Assets
Amortization expense	5,101	5,200	5,350
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	5,554
2020	5,208
2021	4,782
2022	4,329
2023	3,465
Selling, General and Administrative Expenses
Finite-Lived Intangible Assets
Amortization expense	32,772	$ 18,558	$ 15,912
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	35,945
2020	35,453
2021	34,801
2022	33,781
2023	$ 31,444