Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 31,397	$ 32,354	$ 58,980	$ 41,463
Net income attributable to the Company	$ 31,397	$ 32,354	$ 58,980	$ 41,463
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average number of shares used in calculating basic net income per share (in shares)	32,375	32,328	32,363	32,320
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Weighted average number diluted shares outstanding adjustment (in shares)	47	8	48	8
Weighted average number of shares used in calculating diluted net income per share (in shares)	32,422	32,336	32,411	32,328
Average market price of common stock used for calculation of dilutive shares (in dollars per share)	$ 87.53	$ 54.08	$ 83.48	$ 59.73
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings per share (in dollars per share)	0.97	1.00	1.82	1.28
Diluted earnings per share (in dollars per share)	$ 0.97	$ 1.00	$ 1.82	$ 1.28