Equity Incentive Program (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stock-based compensation expense [Abstract]
Pre-tax stock-based compensation expense	$ 7,218	$ 6,872	$ 18,331	$ 18,393
Tax benefit	(731)	(559)	(1,846)	(1,781)
Total stock-based compensation expense, net of tax	$ 6,487	$ 6,313	$ 16,485	$ 16,612
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards issued during period (in shares)			76,509
Fair value at date of grant (in dollars per share)			$ 160.21	$ 122.73
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards issued during period (in shares)			335,285
Risk-free interest rate (in percent)			1.86%	0.59%
Dividend yield (in percent)			1.25%	1.62%
Expected life (years)			5 years 4 months 24 days	5 years 6 months
Volatility (in percent)			29.46%	30.49%
Grant price (in dollars per share)			$ 160.21	$ 122.73
Fair value at date of grant (in dollars per share)			$ 42.07	$ 29.08
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards issued during period (in shares)			40,087
Risk-free interest rate (in percent)			1.68%	0.19%
Dividend yield (in percent)			1.25%	1.62%
Expected life (years)			2 years 10 months 24 days	2 years 10 months 24 days
Volatility (in percent)			31.10%	31.90%
Grant price (in dollars per share)			$ 160.21	$ 122.73
Fair value at date of grant (in dollars per share)			$ 196.40	$ 148.29
Award vesting period			3 years