Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2019		62,843
Beginning Balance at Dec. 31, 2019	$ 462,154	$ 125,686	$ 251,401	$ 137,774	$ (52,707)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(11,324)			(11,324)
Other comprehensive loss	(39,405)				(39,405)
Dividends declared ($0.0025 per share)	(127)			(127)
Share-based compensation expense, exercises and other (in shares)		42
Share-based compensation expense, exercises and other	5,040	$ 84	4,956
Ending Balance (in shares) at Mar. 31, 2020		62,885
Ending Balance at Mar. 31, 2020	$ 416,338	$ 125,770	256,357	126,323	(92,112)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.0025
Beginning Balance (in shares) at Dec. 31, 2019		62,843
Beginning Balance at Dec. 31, 2019	$ 462,154	$ 125,686	251,401	137,774	(52,707)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(66,951)
Ending Balance (in shares) at Jun. 30, 2020		63,737
Ending Balance at Jun. 30, 2020	395,162	$ 127,474	258,733	70,540	(61,585)
Beginning Balance (in shares) at Mar. 31, 2020		62,885
Beginning Balance at Mar. 31, 2020	416,338	$ 125,770	256,357	126,323	(92,112)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(55,627)			(55,627)
Other comprehensive loss	30,527				30,527
Dividends declared ($0.0025 per share)	(156)			(156)
Share-based compensation expense, exercises and other (in shares)		852
Share-based compensation expense, exercises and other	4,080	$ 1,704	2,376
Ending Balance (in shares) at Jun. 30, 2020		63,737
Ending Balance at Jun. 30, 2020	$ 395,162	$ 127,474	258,733	70,540	(61,585)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.0025
Beginning Balance (in shares) at Dec. 31, 2020	73,472	73,472
Beginning Balance at Dec. 31, 2020	$ 712,054	$ 146,944	436,597	167,022	(38,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	69,589			69,589
Other comprehensive loss	7,903				7,903
Dividends declared ($0.0025 per share)	(434)			(434)
Share-based compensation expense, exercises and other (in shares)		1,628
Share-based compensation expense, exercises and other	(2,851)	$ 3,256	(6,107)
Ending Balance (in shares) at Mar. 31, 2021		75,100
Ending Balance at Mar. 31, 2021	$ 786,261	$ 150,200	430,490	236,177	(30,606)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.0025
Beginning Balance (in shares) at Dec. 31, 2020	73,472	73,472
Beginning Balance at Dec. 31, 2020	$ 712,054	$ 146,944	436,597	167,022	(38,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 135,486
Ending Balance (in shares) at Jun. 30, 2021	75,395	75,395
Ending Balance at Jun. 30, 2021	$ 848,019	$ 150,791	428,360	301,886	(33,018)
Beginning Balance (in shares) at Mar. 31, 2021		75,100
Beginning Balance at Mar. 31, 2021	786,261	$ 150,200	430,490	236,177	(30,606)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	65,896			65,896
Other comprehensive loss	(2,412)				(2,412)
Dividends declared ($0.0025 per share)	(187)			(187)
Share-based compensation expense, exercises and other (in shares)		295
Share-based compensation expense, exercises and other	$ (1,539)	$ 591	(2,130)
Ending Balance (in shares) at Jun. 30, 2021	75,395	75,395
Ending Balance at Jun. 30, 2021	$ 848,019	$ 150,791	$ 428,360	$ 301,886	$ (33,018)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.0025