Consolidated Condensed Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
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		8,215		2,944			5,271
Stock-based compensation		3,387		3,387
Dividends on common stock ($0.20 per share)		(5,813)			(5,813)
Comprehensive income (loss):
Cash flow hedging gain, net						3,926
Pension liability, net of income tax						631
Foreign currency translation adjustments						(3,674)
Net income (loss)					9,860
Comprehensive income (loss)		10,743
Balance at period end (shares) at Mar. 31, 2021			31,299
Balance at period end at Mar. 31, 2021		725,570	$ 313	388,959	461,464	(62,798)	(62,368)
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)
Comprehensive income (loss):
Cash flow hedging gain, net		8,064
Pension liability, net of income tax		1,893
Foreign currency translation adjustments		(5,813)
Net income (loss)		38,098
Comprehensive income (loss)		42,242
Balance at period end (shares) at Sep. 30, 2021			31,299
Balance at period end at Sep. 30, 2021		755,683	$ 313	394,810	478,035	(59,537)	(57,938)
Balance at period start (shares) at Mar. 31, 2021			31,299
Balance at period start at Mar. 31, 2021		725,570	$ 313	388,959	461,464	(62,798)	(62,368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee plans		2,726		414			2,312
Stock-based compensation		4,290		4,290
Dividends on common stock ($0.20 per share)		(5,830)			(5,830)
Comprehensive income (loss):
Cash flow hedging gain, net						1,221
Pension liability, net of income tax						631
Foreign currency translation adjustments						2,601
Net income (loss)					13,290
Comprehensive income (loss)		17,743
Balance at period end (shares) at Jun. 30, 2021			31,299
Balance at period end at Jun. 30, 2021		744,499	$ 313	393,663	468,924	(58,345)	(60,056)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee plans		(1,062)		(3,180)			2,118
Stock-based compensation		4,327		4,327
Dividends on common stock ($0.20 per share)		(5,837)			(5,837)
Comprehensive income (loss):
Cash flow hedging gain, net		2,917				2,917
Pension liability, net of income tax		631				631
Foreign currency translation adjustments		(4,740)				(4,740)
Net income (loss)		14,948			14,948
Comprehensive income (loss)		13,756
Balance at period end (shares) at Sep. 30, 2021			31,299
Balance at period end at Sep. 30, 2021		755,683	$ 313	394,810	478,035	(59,537)	(57,938)
Balance at period start (shares) at Dec. 31, 2021			31,299
Balance at period start 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		6,252		2,232			4,020
Stock-based compensation		4,463		4,463
Dividends on common stock ($0.20 per share)		(5,899)			(5,899)
Comprehensive income (loss):
Cash flow hedging gain, net						1,082
Pension liability, net of income tax						521
Foreign currency translation adjustments						(163)
Net income (loss)					14,975
Comprehensive income (loss)		$ 16,415
Accounting Standards Update [Extensible Enumeration]		Accounting Standards Update 2020-06
Balance at period end (shares) at Mar. 31, 2022			31,299
Balance at period end at Mar. 31, 2022		$ 789,546	$ 313	365,555	526,472	(52,763)	(50,031)
Balance at period end (Accounting Standards Update 2020-06) at Mar. 31, 2022	[1]	(17,120)		(37,911)	20,791
Balance at period start (shares) at Dec. 31, 2021			31,299
Balance at period start at Dec. 31, 2021		785,435	$ 313	396,771	496,605	(54,203)	(54,051)
Comprehensive income (loss):
Cash flow hedging gain, net		10,577
Pension liability, net of income tax		1,502
Foreign currency translation adjustments		(18,009)
Net income (loss)		(107,166)
Comprehensive income (loss)		(113,096)
Balance at period end (shares) at Sep. 30, 2022			31,299
Balance at period end at Sep. 30, 2022		716,337	$ 313	407,095	392,144	(60,133)	(23,082)
Balance at period start (shares) at Mar. 31, 2022			31,299
Balance at period start at Mar. 31, 2022		789,546	$ 313	365,555	526,472	(52,763)	(50,031)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee plans		1,244		611			633
Stock-based compensation		5,755		5,755
Dividends on common stock ($0.20 per share)		(6,092)			(6,092)
Stock Issued During Period, Value, Conversion of Convertible Securities		0		(25,890)			25,890
Adjustments to Additional Paid in Capital, Convertible Note Premium on Extinguishment		103,125		103,125
Adjustments to Additional Paid in Capital, Settlement of Convertible Notes Hedge Transactions		118,912		118,912
Adjustments to Additional Paid in Capital, Warrant Settled		(96,758)		(96,758)
Adjustments to Additional Paid in Capital, Convertible Note Hedge, Net of Income Tax		(142,128)		(142,128)
Issuance of warrants		72,000		72,000
Comprehensive income (loss):
Cash flow hedging gain, net						4,662
Pension liability, net of income tax						490
Foreign currency translation adjustments						(9,497)
Net income (loss)					(168,291)
Comprehensive income (loss)		(172,636)
Balance at period end (shares) at Jun. 30, 2022			31,299
Balance at period end at Jun. 30, 2022		672,968	$ 313	401,182	352,089	(57,108)	(23,508)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee plans		585		159			426
Stock-based compensation		5,754		5,754
Dividends on common stock ($0.20 per share)		(6,095)			(6,095)
Comprehensive income (loss):
Cash flow hedging gain, net		4,833				4,833
Pension liability, net of income tax		490				490
Foreign currency translation adjustments		(8,348)				(8,348)
Net income (loss)		46,150			46,150
Comprehensive income (loss)		43,125
Balance at period end (shares) at Sep. 30, 2022			31,299
Balance at period end at Sep. 30, 2022		$ 716,337	$ 313	$ 407,095	$ 392,144	$ (60,133)	$ (23,082)

[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. Refer to Note 3 for further detail.