Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock
Balance, beginning of period (in shares) at Dec. 31, 2018			181,931,225
Balance, beginning of period at Dec. 31, 2018	$ 1,773,949		$ 1,819	$ 1,459,620	$ 2,007,583		$ (629,684)	$ (1,065,389)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	423,635				423,635
Other comprehensive income (loss), net of tax	92,735						92,735
Dividends ($1.50 per share)	(237,221)				(237,221)
Repurchase of common stock	(296,520)							(296,520)
Options granted (in shares)			885,311
Share-based compensation	47,421		$ 9	31,384				16,028
Balance, end of period (in shares) at Dec. 31, 2019			182,816,536
Balance, end of period at Dec. 31, 2019	$ 1,803,999	$ (78,229)	$ 1,828	1,491,004	2,193,997	$ (78,229)	(536,949)	(1,345,881)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Net income	$ 1,298				1,298
Other comprehensive income (loss), net of tax	53,532						53,532
Dividends ($1.50 per share)	(68,087)				(68,087)
Repurchase of common stock	(8,006)							(8,006)
Options granted (in shares)			686,990
Share-based compensation	18,278		$ 7	16,702				1,569
Retirement of treasury stock	$ 0		$ (150)		(764,156)			764,306
Retirement of treasury stock (in shares)	(15,000,000)		(15,000,000)
Balance, end of period (in shares) at Dec. 31, 2020			168,503,526
Balance, end of period at Dec. 31, 2020	$ 1,722,785		$ 1,685	1,507,706	1,284,823		(483,417)	(588,012)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	650,024				650,024
Other comprehensive income (loss), net of tax	242,498						242,498
Dividends ($1.50 per share)	(92,426)				(92,426)
Repurchase of common stock	$ (11,623)							(11,623)
Options granted (in shares)	500,000		861,160
Share-based compensation	$ 41,986		$ 9	39,305				2,672
Balance, end of period (in shares) at Dec. 31, 2021			169,364,686
Balance, end of period at Dec. 31, 2021	$ 2,553,244		$ 1,694	$ 1,547,011	$ 1,842,421		$ (240,919)	$ (596,963)