Unaudited Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Stockholders' Equity beginning balance at Dec. 31, 2020	$ 3,355,411	$ 126	$ 2,749,900	$ 5,416,945	$ (1,363,158)	$ (3,448,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	184,239			184,239
Other comprehensive income (loss), net of tax	(117,861)				(117,861)
Acquisition of common stock	(170,382)					(170,382)
Share-based compensation	17,747		17,747
Issuance of common stock	27,345	1	27,344
Stockholders' Equity ending balance at Mar. 31, 2021	3,296,499	127	2,794,991	5,601,184	(1,481,019)	(3,618,784)
Stockholders' Equity beginning balance at Dec. 31, 2020	3,355,411	126	2,749,900	5,416,945	(1,363,158)	(3,448,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	380,486
Other comprehensive income (loss), net of tax	97,981
Stockholders' Equity ending balance at Jun. 30, 2021	3,488,847	127	2,821,453	5,797,431	(1,265,177)	(3,864,987)
Stockholders' Equity beginning balance at Mar. 31, 2021	3,296,499	127	2,794,991	5,601,184	(1,481,019)	(3,618,784)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	196,247			196,247
Other comprehensive income (loss), net of tax	215,842				215,842
Acquisition of common stock	(246,203)					(246,203)
Share-based compensation	17,885		17,885
Issuance of common stock	8,577		8,577
Stockholders' Equity ending balance at Jun. 30, 2021	3,488,847	127	2,821,453	5,797,431	(1,265,177)	(3,864,987)
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)
Share-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)
Share-based compensation	34,017		34,017
Issuance of common stock	10,027		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)