Income Taxes Income Tax (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Valuation Allowance [Line Items]
Provision for income taxes	$ 17,219	$ 10,957	$ 26,829	$ 16,713
Effective Income Tax Rate Reconciliation, Percent	24.00%	26.60%	23.70%	25.80%
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ 800		$ 1,200
Proceeds and Excess Tax Benefit from Share-based Compensation			$ 400

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

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