Unaudited Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Stockholders' Equity beginning balance at Dec. 31, 2021	$ 2,866,580	$ 127	$ 2,878,751	$ 6,256,442	$ (1,464,616)	$ (4,804,124)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	217,952			217,952
Other comprehensive income (loss), net of tax	201,179				201,179
Acquisition of common stock	(422,736)					(422,736)
Stock-based compensation	32,631		32,631
Issuance of common stock	8,810		8,810
Stockholders' Equity ending balance at Mar. 31, 2022	2,904,416	127	2,920,192	6,474,394	(1,263,437)	(5,226,860)
Stockholders' Equity beginning balance at Dec. 31, 2021	2,866,580	127	2,878,751	6,256,442	(1,464,616)	(4,804,124)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	480,123
Other comprehensive income (loss), net of tax	50,783
Stockholders' Equity ending balance at Jun. 30, 2022	2,687,669	128	2,964,235	6,736,565	(1,413,833)	(5,599,426)
Stockholders' Equity beginning balance at Mar. 31, 2022	2,904,416	127	2,920,192	6,474,394	(1,263,437)	(5,226,860)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	262,171			262,171
Other comprehensive income (loss), net of tax	(150,396)				(150,396)
Acquisition of common stock	(372,566)					(372,566)
Stock-based compensation	34,017		34,017
Issuance of common stock	10,027	1	10,026
Stockholders' Equity ending balance at Jun. 30, 2022	2,687,669	128	2,964,235	6,736,565	(1,413,833)	(5,599,426)
Stockholders' Equity beginning balance at Dec. 31, 2022	2,541,493	128	3,049,570	7,210,769	(1,509,650)	(6,209,324)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	214,835			214,835
Other comprehensive income (loss), net of tax	75,634				75,634
Acquisition of common stock	(9,597)					(9,597)
Stock-based compensation	26,096		26,096
Issuance of common stock	33,399		33,399
Stockholders' Equity ending balance at Mar. 31, 2023	2,881,860	128	3,109,065	7,425,604	(1,434,016)	(6,218,921)
Stockholders' Equity beginning balance at Dec. 31, 2022	2,541,493	128	3,049,570	7,210,769	(1,509,650)	(6,209,324)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	454,537
Other comprehensive income (loss), net of tax	152,387
Stockholders' Equity ending balance at Jun. 30, 2023	3,263,436	128	3,176,562	7,665,306	(1,357,263)	(6,221,297)
Stockholders' Equity beginning balance at Mar. 31, 2023	2,881,860	128	3,109,065	7,425,604	(1,434,016)	(6,218,921)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	239,702			239,702
Other comprehensive income (loss), net of tax	76,753				76,753
Acquisition of common stock	(2,376)					(2,376)
Stock-based compensation	34,748		34,748
Issuance of common stock	32,749		32,749
Stockholders' Equity ending balance at Jun. 30, 2023	$ 3,263,436	$ 128	$ 3,176,562	$ 7,665,306	$ (1,357,263)	$ (6,221,297)