Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to the Company	$ 39,201	$ 31,397	$ 66,938	$ 58,980
Weighted average number of shares:
Weighted average number of shares used in calculating basic net income per share (in shares)	31,268	32,375	31,571	32,363
Effect of dilutive stock-based compensation plans:
Weighted average number of shares used in calculating diluted net income per share (in shares)	31,378	32,422	31,668	32,411
Average market price of common stock used for calculation of dilutive shares (in dollars per share)	$ 81.46	$ 87.53	$ 83.77	$ 83.48
Net income attributable to the Company per share:
Earnings per share attributable to Company shareholders - Basic (in dollars per share)	1.25	0.97	2.12	1.82
Earnings per share attributable to Company shareholders - Diluted (in dollars per share)	$ 1.25	$ 0.97	$ 2.11	$ 1.82
Stock options
Effect of dilutive stock-based compensation plans:
Weighted average number diluted shares outstanding adjustment (in shares)	0	1	0	2
RSU And MPP
Effect of dilutive stock-based compensation plans:
Weighted average number diluted shares outstanding adjustment (in shares)	110	46	97	46