Income Taxes Income Tax (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Valuation Allowance [Line Items]
Provision for income taxes	$ 21,572	$ 12,226	$ 48,401	$ 28,939
Effective Income Tax Rate Reconciliation, Percent	22.70%	24.40%	23.20%	25.20%
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ 2,500		$ 3,700
Proceeds and Excess Tax Benefit from Share-based Compensation			$ 400