CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common stock	Paid-in capital	Paid-in capital Cumulative Effect, Period of Adoption, Adjustment	Paid-in capital Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury stock	Accumulated other comprehensive income (loss)	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Retained earnings Cumulative Effect, Period of Adoption, Adjusted Balance
Balance, beginning of year at Dec. 31, 2018		$ 371,353	$ 1,862,536		$ 1,862,536	$ (175,059)	$ (124,214)	$ 1,647,275		$ 1,647,275
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reacquisition of convertible junior subordinated debentures-equity component			0
Reissuance of treasury stock, net under share-based compensation plans			(11,715)			5,989
Equity compensation			18,898
Purchases of common stock						(114,126)
Other comprehensive (loss) income	$ 196,922						196,922
Net income	673,763							673,763
Cash dividends								(42,388)
Balance, end of year at Dec. 31, 2019	4,309,234	371,353	1,869,719		1,869,719	(283,196)	72,708	2,278,650		2,278,650
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reacquisition of convertible junior subordinated debentures-equity component			(2,673)
Reissuance of treasury stock, net under share-based compensation plans			(18,807)			9,867
Equity compensation			13,803
Purchases of common stock						(119,997)
Other comprehensive (loss) income	144,113						144,113
Net income	446,093							446,093
Cash dividends								(82,647)
Balance, end of year at Dec. 31, 2020	$ 4,698,986	371,353	1,862,042	$ (68,289)	$ 1,793,753	(393,326)	216,821	2,642,096	$ 68,289	$ 2,710,385
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06 [Member]
Reissuance of treasury stock, net under share-based compensation plans			(15,956)			8,879
Equity compensation			17,109
Purchases of common stock						(290,818)
Other comprehensive (loss) income	$ (97,124)						(97,124)
Net income	634,983							634,983
Cash dividends								(94,677)
Balance, end of year at Dec. 31, 2021	$ 4,861,382	$ 371,353	$ 1,794,906			$ (675,265)	$ 119,697	$ 3,250,691
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06 [Member]