Equity Incentive Program (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock-based compensation expense [Abstract]
Pre-tax stock-based compensation expense	$ 6,660	$ 7,371	$ 25,053	$ 15,591
Tax benefit	(576)	(854)	(2,357)	(1,822)
Total stock-based compensation expense, net of tax	$ 6,084	$ 6,517	$ 22,696	$ 13,769
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards issued during period (in shares)			413,173
Risk-free interest rate (in hundredths)			0.59%	1.44%
Dividend yield (in hundredths)			1.62%	1.65%
Expected life (in years)			5 years 6 months	5 years 6 months
Volatility (in hundredths)			30.49%	22.76%
Grant price (in dollars per share)			$ 122.73	$ 119.86
Fair value at date of grant (in dollars per share)			$ 29.08	$ 22.54
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards issued during period (in shares)			50,371
Risk-free interest rate (in hundredths)			0.19%	1.40%
Dividend yield (in hundredths)			1.62%	1.65%
Expected life (in years)			2 years 10 months 24 days	2 years 10 months 24 days
Volatility (in hundredths)			31.90%	23.30%
Grant price (in dollars per share)			$ 122.73	$ 119.86
Fair value at date of grant (in dollars per share)			$ 148.29	$ 165.71
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards issued during period (in shares)			83,993

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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