Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance at Dec. 31, 2019		$ 1,751	$ 289,422	$ 2,141,302	$ (665)	$ (259,742)	$ (1,149,411)
Beginning balance (in shares) at Dec. 31, 2019		110,780
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units (in shares)		365
Repurchases of common stock (in shares)		(259)
Stock compensation expense			13,880
Net issuance of treasury stock for vested restricted stock units			(1,839)				(4,382)
Net income	$ 248,623			248,623
Dividends declared on common stock				(40,532)
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Other comprehensive (loss) income						(12,610)
Repurchases of common stock							(6,934)
Ending balance at Sep. 30, 2020	$ 1,218,863	$ 1,751	301,463	2,348,728		(272,352)	(1,160,727)
Ending balance (in shares) at Sep. 30, 2020		110,886
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock per share (usd per share)	$ 0.36
Beginning balance at Jun. 30, 2020		$ 1,751	296,639	2,249,391		(297,360)	(1,160,727)
Beginning balance (in shares) at Jun. 30, 2020		110,886
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units (in shares)		0
Repurchases of common stock (in shares)		0
Stock compensation expense			4,824
Net issuance of treasury stock for vested restricted stock units			0				0
Net income	$ 112,851			112,851
Dividends declared on common stock				(13,514)
Other comprehensive (loss) income						25,008
Repurchases of common stock							0
Ending balance at Sep. 30, 2020	$ 1,218,863	$ 1,751	301,463	2,348,728		(272,352)	(1,160,727)
Ending balance (in shares) at Sep. 30, 2020		110,886
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock per share (usd per share)	$ 0.12
Beginning balance at Dec. 31, 2020	$ 1,252,873	$ 1,751	306,363	2,395,395		(260,953)	(1,189,683)
Beginning balance (in shares) at Dec. 31, 2020		110,057
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units (in shares)		353
Repurchases of common stock (in shares)		0
Stock compensation expense			15,605
Net issuance of treasury stock for vested restricted stock units			(1,836)				(6,737)
Net income	274,049			274,049
Dividends declared on common stock				(47,043)
Other comprehensive (loss) income						(30,205)
Repurchases of common stock							0
Ending balance at Sep. 30, 2021	$ 1,456,706	$ 1,751	320,132	2,622,401		(291,158)	(1,196,420)
Ending balance (in shares) at Sep. 30, 2021		110,410
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock per share (usd per share)	$ 0.42
Beginning balance at Jun. 30, 2021		$ 1,751	314,873	2,531,783		(263,433)	(1,196,394)
Beginning balance (in shares) at Jun. 30, 2021		110,408
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units (in shares)		2
Repurchases of common stock (in shares)		0
Stock compensation expense			5,268
Net issuance of treasury stock for vested restricted stock units			(9)				(26)
Net income	$ 106,292			106,292
Dividends declared on common stock				(15,674)
Other comprehensive (loss) income						(27,725)
Repurchases of common stock							0
Ending balance at Sep. 30, 2021	$ 1,456,706	$ 1,751	$ 320,132	$ 2,622,401		$ (291,158)	$ (1,196,420)
Ending balance (in shares) at Sep. 30, 2021		110,410
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock per share (usd per share)	$ 0.14