Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance at Dec. 31, 2020		$ 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)		329
Stock compensation expense			5,010
Net issuance of treasury stock for vested restricted stock units			(1,738)			(6,537)
Net income	$ 73,281			73,281
Dividends declared on common stock				(15,680)
Other comprehensive income (loss)					(30,853)
Ending balance at Mar. 31, 2021	$ 1,276,356	$ 1,751	309,635	2,452,996	(291,806)	(1,196,220)
Ending balance (in shares) at Mar. 31, 2021		110,386
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock per share (usd per share)	$ 0.14
Beginning balance at Dec. 31, 2021	$ 1,562,696	$ 1,751	325,448	2,691,745	(259,828)	(1,196,420)
Beginning balance (in shares) at Dec. 31, 2021		110,410
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units (in shares)		390
Stock compensation expense			4,879
Net issuance of treasury stock for vested restricted stock units			(2,126)			(9,348)
Net income	84,875			84,875
Dividends declared on common stock				(17,923)
Other comprehensive income (loss)					15,186
Ending balance at Mar. 31, 2022	$ 1,638,239	$ 1,751	$ 328,201	$ 2,758,697	$ (244,642)	$ (1,205,768)
Ending balance (in shares) at Mar. 31, 2022		110,800
Increase (Decrease) in Stockholders' Equity
Dividends declared on common stock per share (usd per share)	$ 0.16