Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock, Common
Beginning balance at Dec. 31, 2020	$ 282,675	$ 448	$ 805,140	$ 5,095,596	$ (334,925)	$ (5,283,584)
Beginning balance, shares at Dec. 31, 2020		23,471,841
Exercise of stock options and restricted stock units, shares	110,748	110,748
Exercise of stock options and restricted stock units, Value	$ (20,463)			(5,309)		(24,533)
Repurchases of Common Stock, Shares	(739,486)	(739,486)
Repurchases of Common Stock, Value	$ (999,998)					(999,998)
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	19,595		19,595
Net earnings	768,985			768,985
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	79,701				79,701
Ending balance at Dec. 31, 2021	$ 171,421	$ 448	825,974	5,859,272	(255,224)	(6,259,049)
Ending balance, shares at Dec. 31, 2021		22,843,103
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition			1,239
Exercise of stock options and restricted stock units, shares	133,916	133,916
Exercise of stock options and restricted stock units, Value	$ (33,216)			(4,908)		(33,391)
Repurchases of Common Stock, Shares	(838,010)	(838,010)
Repurchases of Common Stock, Value	$ (1,099,998)					(1,099,998)
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	19,661		19,661
Net earnings	872,502			872,502
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	27,991				27,991
Ending balance at Dec. 31, 2022	$ 24,793	$ 448	850,368	6,726,866	(227,233)	(7,325,656)
Ending balance, shares at Dec. 31, 2022	22,139,009	22,139,009
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition			4,733
Exercise of stock options and restricted stock units, shares	79,076	79,076
Exercise of stock options and restricted stock units, Value	$ (19,234)			(4,888)		(21,308)
Repurchases of Common Stock, Shares	691,913	(691,913)
Repurchases of Common Stock, Value	$ (900,000)					(900,000)
Excise tax on net repurchases of common stock						8,089
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	17,928		17,928
Net earnings	788,778			788,778
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(92,582)				(92,582)
Ending balance at Dec. 31, 2023	$ (149,938)	$ 448	871,110	$ 7,510,756	$ (319,815)	$ (8,212,437)
Ending balance, shares at Dec. 31, 2023	21,526,172	21,526,172
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition			$ 2,814