Condensed Consolidated Statements Of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Accumulated Other Comprehensive Loss [Member]	[1]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2020	$ 2,053,244	$ 606	$ 47,464	$ (109,233)		$ 2,480,321	$ (366,490)	$ 576
Net income including noncontrolling interests	84,945					84,774		171
Other comprehensive income (loss)	1,389			1,389
Common stock issued under share-based compensation plans	1	1
Tax withholding for common stock issued under share-based compensation plans	(3,750)		(3,750)
Common stock issued under employee stock purchase plan	1,731		1,731
Common stock dividends	(7,121)					(7,176)
Common stock dividends, accrued dividend shares			55
Repurchases of common stock	(12,917)						(12,917)
Distributions to noncontrolling interests	(43)							(43)
Share-based compensation expense	3,193		3,193
Balance at Mar. 31, 2021	2,120,672	607	48,693	(107,844)		2,557,919	(379,407)	704
Balance at Dec. 31, 2021	2,253,089	607	61,874	(83,562)		2,835,504	(562,036)	702
Net income including noncontrolling interests	73,386					73,386
Other comprehensive income (loss)	(2,387)			(2,387)
Common stock issued under share-based compensation plans	1	1
Tax withholding for common stock issued under share-based compensation plans	(4,944)		(4,944)
Common stock issued under employee stock purchase plan	1,955		1,955
Common stock dividends	(6,930)					(6,981)
Common stock dividends, accrued dividend shares			51
Repurchases of common stock	(181,810)						(181,810)
Share-based compensation expense	3,438		3,438
Balance at Mar. 31, 2022	$ 2,135,798	$ 608	$ 62,374	$ (85,949)		$ 2,901,909	$ (743,846)	$ 702

[1] Represents cumulative foreign currency translation adjustments and post retirement liability adjustments.