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, 2018		62,294
Beginning Balance at Dec. 31, 2018	$ 518,419	$ 124,588	$ 238,773	$ 200,670	$ (45,612)
Ending Balance at Mar. 31, 2019	501,839	$ 125,872	241,547	186,455	(52,035)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(14,096)			(14,096)
Other comprehensive loss	(6,423)				(6,423)
Dividends declared ($0.0025 per share)	(119)			(119)
Share-based compensation expense, exercises and other (in shares)		642
Share-based compensation expense, exercises and other	$ 4,058	$ 1,284	2,774
Ending Balance (in shares) at Mar. 31, 2019		62,936
Beginning Balance (in shares) at Dec. 31, 2019	62,843	62,843
Beginning Balance at Dec. 31, 2019	$ 462,154				(52,707)
Ending Balance at Mar. 31, 2020	416,338	$ 125,770	$ 256,357	126,323	$ (92,112)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(11,324)			(11,324)
Other comprehensive loss	(39,405)
Dividends declared ($0.0025 per share)	(127)			$ (127)
Share-based compensation expense, exercises and other	$ 5,040
Ending Balance (in shares) at Mar. 31, 2020	62,885	62,885