Operating Segments and Related Information Operating Segments and related information (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Unallocated corporate expense	$ (37,274)	$ (36,244)
Amortization of purchased Intangible Assets	(12,000)	(11,900)
Other	(622)	(20,784)
Consolidated earnings from operations	52,462	28,495
Other Nonoperating Expense	(2,452)	(5,297)
Consolidated earnings before income taxes	50,010	23,198
Acquisition-related Costs [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Amortization of purchased Intangible Assets	(11,924)	(11,896)
Total Segments [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Consolidated segment operating income	102,282	97,419
Consolidated earnings from operations	$ 102,282	$ 97,419