CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments	Total
Increase (Decrease) in Stockholders' Equity
Balance (ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments) at Dec. 31, 2019	$ 1,397	$ 2,495,853		$ 291,919	$ (132,195)	$ (132,135)		$ 2,524,839
Balance at Dec. 31, 2018	$ 1,397	2,495,853		291,919	(132,195)	(132,135)		2,524,839
Balance (in shares) at Dec. 31, 2018	134,874,302
Increase (Decrease) in Stockholders' Equity
Net income				284,392				284,392
Cash dividends declared				(138,246)				(138,246)
Equity-based awards	$ 2	7,824		(993)		(1,764)		5,069
Equity-based awards (in shares)	194,187
Common stock repurchased						(136,242)		(136,242)
Common stock repurchased (in shares)	(5,140,010)
Other comprehensive income (loss), net of tax					100,446			100,446
Balance at Dec. 31, 2019	$ 1,399	2,503,677		437,072	(31,749)	(270,141)		2,640,258
Balance (in shares) at Dec. 31, 2019	129,928,479
Increase (Decrease) in Stockholders' Equity
Balance (ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments) at Dec. 31, 2019	$ 1,399	2,503,677		437,072	(31,749)	(270,141)		2,640,258
Net income				185,754				185,754
Cash dividends declared				(135,099)				(135,099)
Common stock issued under Employee Stock Purchase Plan		312						312
Common stock issued under Employee Stock Purchase Plan (in shares)	19,069
Equity-based awards	$ 3	10,025		(1,236)		(1,749)		7,043
Equity-based awards (in shares)	182,483
Common stock repurchased						(5,000)		(5,000)
Common stock repurchased (in shares)	(217,759)
Other comprehensive income (loss), net of tax					63,353			63,353
Balance at Dec. 31, 2020	$ 1,402	2,514,014	$ (12,517)	473,974	31,604	(276,890)	$ (12,517)	$ 2,744,104
Balance (in shares) at Dec. 31, 2020	129,912,272							129,912,272
Increase (Decrease) in Stockholders' Equity
Balance (ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments) at Dec. 31, 2019	$ 1,402	2,514,014	$ (12,517)	473,974	31,604	(276,890)	$ (12,517)	$ 2,744,104
Net income				265,735				265,735
Cash dividends declared				(134,133)				(134,133)
Common stock issued under Employee Stock Purchase Plan		547						547
Common stock issued under Employee Stock Purchase Plan (in shares)	21,070
Equity-based awards	$ 4	13,102		(1,042)		(3,108)		8,956
Equity-based awards (in shares)	248,662
Common stock repurchased						(75,000)		(75,000)
Common stock repurchased (in shares)	(2,679,532)
Other comprehensive income (loss), net of tax					(153,297)			(153,297)
Balance at Dec. 31, 2021	$ 1,406	2,527,663		604,534	(121,693)	(354,998)		$ 2,656,912
Balance (in shares) at Dec. 31, 2021	127,502,472							127,502,472
Increase (Decrease) in Stockholders' Equity
Balance (ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments) at Dec. 31, 2019	$ 1,406	$ 2,527,663		$ 604,534	$ (121,693)	$ (354,998)		$ 2,656,912