Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock, Common
Balance at period start (shares) at Dec. 31, 2020			31,299
Balance at period start at Dec. 31, 2020		$ 709,038	$ 313	$ 382,628	$ 457,417	$ (63,681)	$ (67,639)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee plans		11,396		(2,192)			13,588
Stock-based compensation		16,335		16,335
Dividends on common stock ($.80 per share)		(23,354)			(23,354)
Comprehensive income (loss):
Cash flow hedging loss, net						9,601
Pension liability, net						6,949
Foreign currency translation adjustments						(7,072)
Net income (loss)		62,542			62,542
Comprehensive income (loss)		72,020
Balance at period end (shares) at Dec. 31, 2021			31,299
Balance at period end at Dec. 31, 2021		785,435	$ 313	396,771	496,605	(54,203)	(54,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee plans		8,770		3,385			5,385
Stock-based compensation		21,729		21,729
Dividends on common stock ($.80 per share)		(24,183)			(24,183)
Shares issued for the settlement of convertible notes		0		(25,890)			25,890
Convertible notes premium on extinguishment		103,125		103,125
Settlement of convertible notes hedge transactions		118,912		118,912
Settlement of warrants		(96,758)		(96,758)
Issuance of convertible notes hedge transactions, net of tax		(142,128)		(142,128)
Issuance of warrants		72,000		72,000
Comprehensive income (loss):
Cash flow hedging loss, net						(1,159)
Pension liability, net						5,922
Foreign currency translation adjustments						(8,418)
Net income (loss)		(80,582)			(80,582)
Comprehensive income (loss)		$ (84,237)
Accounting Standards Update [Extensible Enumeration]	[1]	Accounting Standards Update 2020-06
Balance at period end (shares) at Dec. 31, 2022			31,299
Balance at period end at Dec. 31, 2022		$ 745,545	$ 313	413,235	412,631	(57,858)	(22,776)
Balance at period end (Accounting Standards Update 2020-06) at Dec. 31, 2022	[1]	(17,120)		(37,911)	20,791
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee plans		16,832		9,043			7,789
Stock-based compensation		24,257		24,257
Dividends on common stock ($.80 per share)		(24,559)			(24,559)
Comprehensive income (loss):
Cash flow hedging loss, net						(2,380)
Pension liability, net						4,983
Foreign currency translation adjustments						5,085
Net income (loss)		64,459			64,459
Comprehensive income (loss)		72,147
Balance at period end (shares) at Dec. 31, 2023			31,299
Balance at period end at Dec. 31, 2023		$ 834,222	$ 313	$ 446,535	$ 452,531	$ (50,170)	$ (14,987)

[1] (1)We recorded the cumulative impact of adopting ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity in 2022.