Income Taxes Income Tax (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Valuation Allowance [Line Items]
Provision for income taxes	$ 25,160	$ 21,572	$ 84,265	$ 48,401
Effective Income Tax Rate Reconciliation, Percent	21.70%	22.70%	22.90%	23.20%
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ 2,100