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)		313
Repurchases of common stock (in shares)		(259)
Repurchases of common stock							(6,934)
Stock compensation expense			4,483
Net issuance of treasury stock for vested restricted stock units			(1,622)				(4,108)
Net income	$ 57,600			57,600
Dividends declared on common stock				(13,546)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Other comprehensive loss						(37,955)
Ending balance at Mar. 31, 2020	$ 1,020,575	$ 1,751	292,283	2,184,691		(297,697)	(1,160,453)
Ending balance (in shares) at Mar. 31, 2020		110,834
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	$ 0	(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
Repurchases of common stock (in shares)		0
Repurchases of common stock							0
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 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