Acquisitions, Goodwill And Other Intangible Assets (Summary of Estimated Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets
Amortization expense	$ 21,262	$ 19,573	$ 17,758
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	21,600
2020	19,200
2021	17,700
2022	16,700
2023	15,600
Cost of Sales
Finite-Lived Intangible Assets
Amortization expense	5,350	5,631	5,967
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	4,600
2020	3,200
2021	2,300
2022	1,700
2023	1,300
Selling, General and Administrative Expenses
Finite-Lived Intangible Assets
Amortization expense	15,912	$ 13,942	$ 11,791
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2019	17,000
2020	16,000
2021	15,400
2022	15,000
2023	$ 14,300