CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Issued	Common Stock in Treasury	Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance (in shares) at Dec. 31, 2018		23,933	(10,116)
Balance at Dec. 31, 2018	$ 262,960	$ 239	$ (275,889)	$ 276,103	$ (20,281)	$ 282,788
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,005)					(1,005)
Currency translation adjustment	1,733
Shares issued for employee benefit plan and compensation (in shares)		78
Shares issued for employee benefit plan and compensation	$ 347	$ 1		346
Purchase of treasury shares (in shares)	(43)		(43)
Purchase of treasury shares	$ (1,215)		$ (1,215)
Shares issued to directors (in shares)		8
Shares issued to directors	0	$ 0		0
Employee and director stock-based compensation	1,918			1,918
Performance-based common stock warrants	434			434
Balance (in shares) at Mar. 31, 2019		24,019	(10,159)
Balance at Mar. 31, 2019	265,172	$ 240	$ (277,104)	278,801	(18,548)	281,783
Balance (in shares) at Dec. 31, 2019		24,118	(10,174)
Balance at Dec. 31, 2019	274,399	$ 241	$ (277,817)	288,338	(22,781)	286,418
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5,846					5,846
Currency translation adjustment	(7,009)
Shares issued for employee benefit plan and compensation (in shares)		129
Shares issued for employee benefit plan and compensation	$ 527	$ 1		526
Purchase of treasury shares (in shares)	(169)		(169)
Purchase of treasury shares	$ (6,291)		$ (6,291)
Shares issued to directors (in shares)		9
Shares issued to directors	0	$ 1		(1)
Employee and director stock-based compensation	2,303			2,303
Performance-based common stock warrants	184			184
Balance (in shares) at Mar. 31, 2020		24,256	(10,343)
Balance at Mar. 31, 2020	$ 269,959	$ 243	$ (284,108)	$ 291,350	$ (29,790)	$ 292,264