CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Common stock	Paid-in capital	Retained earnings (accumulated deficit)	Accumulated other comprehensive  loss
Beginning Balance (in shares) at Dec. 31, 2019			21,256,000
Balance at beginning of year at Dec. 31, 2019		$ 236,317	$ 213	$ 263,386	$ 7,173	$ (34,455)
Comprehensive (loss) income:
Net income (loss)		(28,164)			(28,164)
Translation adjustment		(4,458)				(4,458)
Net change in cash flow hedges		(2,877)				(2,877)
Effect of retirement benefit obligations		20				20
Comprehensive income (loss)		(35,479)
Performance shares issued to employees (in shares)			62,000
Performance shares issued to employees			$ 1	(1)
Net issuance of restricted shares to employees and directors (in shares)			220,000
Net issuance of restricted shares granted to employees			$ 2	(2)
Stock compensation expense		1,320		1,320
Shares effectively repurchased for required employee withholding taxes (in shares)			(52,000)
Shares effectively repurchased for required employee withholding taxes		(299)	$ (1)	(298)
Dividends	[1]	(932)			(932)
Ending Balance (in shares) at Mar. 31, 2020			21,486,000
Balance at end of year at Mar. 31, 2020		200,927	$ 215	264,405	(21,923)	(41,770)
Beginning Balance (in shares) at Dec. 31, 2019			21,256,000
Balance at beginning of year at Dec. 31, 2019		236,317	$ 213	263,386	7,173	(34,455)
Comprehensive (loss) income:
Net income (loss)		(32,141)
Translation adjustment		(6,972)
Net change in cash flow hedges		(2,776)
Effect of retirement benefit obligations		39
Comprehensive income (loss)		(41,850)
Ending Balance (in shares) at Jun. 30, 2020			21,769,000
Balance at end of year at Jun. 30, 2020		194,871	$ 218	265,630	(26,813)	(44,164)
Beginning Balance (in shares) at Mar. 31, 2020			21,486,000
Balance at beginning of year at Mar. 31, 2020		200,927	$ 215	264,405	(21,923)	(41,770)
Comprehensive (loss) income:
Net income (loss)		(3,977)			(3,977)
Translation adjustment		(2,514)				(2,514)
Net change in cash flow hedges		101				101
Effect of retirement benefit obligations		19				19
Comprehensive income (loss)		(6,371)
Net issuance of restricted shares to employees and directors (in shares)			309,000
Net issuance of restricted shares granted to employees			$ 3	(3)
Stock compensation expense		1,415		1,415
Shares effectively repurchased for required employee withholding taxes (in shares)			(26,000)
Shares effectively repurchased for required employee withholding taxes		(187)		(187)
Dividends	[1]	(913)			(913)
Ending Balance (in shares) at Jun. 30, 2020			21,769,000
Balance at end of year at Jun. 30, 2020		194,871	$ 218	265,630	(26,813)	(44,164)
Beginning Balance (in shares) at Dec. 31, 2020			21,755,000
Balance at beginning of year at Dec. 31, 2020		230,136	$ 218	268,666	424	(39,172)
Comprehensive (loss) income:
Net income (loss)		3,067			3,067
Translation adjustment		1,829				1,829
Net change in cash flow hedges		(173)				(173)
Effect of retirement benefit obligations		27				27
Comprehensive income (loss)		4,750
Performance shares issued to employees (in shares)			150,000
Performance shares issued to employees			$ 1	(1)
Net issuance of restricted shares to employees and directors (in shares)			177,000
Net issuance of restricted shares granted to employees			$ 2	(2)
Stock compensation expense		1,439		1,439
Net exercise of stock options (in shares)			44,000
Net exercise of stock options		184		184
Shares effectively repurchased for required employee withholding taxes (in shares)			(146,000)
Shares effectively repurchased for required employee withholding taxes		(2,160)	$ (1)	(2,159)
Dividends	[1]	(943)			(943)
Ending Balance (in shares) at Mar. 31, 2021			21,980,000
Balance at end of year at Mar. 31, 2021		233,406	$ 220	268,127	2,548	(37,489)
Beginning Balance (in shares) at Dec. 31, 2020			21,755,000
Balance at beginning of year at Dec. 31, 2020		230,136	$ 218	268,666	424	(39,172)
Comprehensive (loss) income:
Net income (loss)		8,856
Translation adjustment		4,223
Net change in cash flow hedges		63
Effect of retirement benefit obligations		68
Comprehensive income (loss)		$ 13,210
Net exercise of stock options (in shares)		219,025
Dividends					(1,900)
Ending Balance (in shares) at Jun. 30, 2021			22,007,000
Balance at end of year at Jun. 30, 2021		$ 241,801	$ 220	268,976	7,423	(34,818)
Beginning Balance (in shares) at Mar. 31, 2021			21,980,000
Balance at beginning of year at Mar. 31, 2021		233,406	$ 220	268,127	2,548	(37,489)
Comprehensive (loss) income:
Net income (loss)		5,789			5,789
Translation adjustment		2,394				2,394
Net change in cash flow hedges		236				236
Effect of retirement benefit obligations		41				41
Comprehensive income (loss)		8,460
Net issuance of restricted shares to employees and directors (in shares)			44,000
Net issuance of restricted shares granted to employees			$ 0	0
Stock compensation expense		1,323		1,323
Net exercise of stock options (in shares)			50,000
Net exercise of stock options		551	$ 1	550
Shares effectively repurchased for required employee withholding taxes (in shares)			(67,000)
Shares effectively repurchased for required employee withholding taxes		(1,025)	$ (1)	(1,024)
Dividends	[1]	(914)			(914)
Ending Balance (in shares) at Jun. 30, 2021			22,007,000
Balance at end of year at Jun. 30, 2021		$ 241,801	$ 220	$ 268,976	$ 7,423	$ (34,818)

[1] Cash dividends declared per share of common stock were $0.0850 and $0.0850 in the six months ended June 30, 2021 and 2020, respectively.