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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive income (loss) [Member]	Parent [Member]	Noncontrolling interest [Member]
Balance, Beginning (in shares) at Dec. 31, 2018		59,916,973
Balance, Beginning at Dec. 31, 2018	$ (270,097)		$ (519,498)	$ 29,048	$ 7,831	$ 203,571	$ (279,048)	$ 8,951
Net loss				1,977			1,977
Currency translation adjustment, net						(5,281)	(5,281)	474
Temporary Equity, Foreign Currency Translation Adjustments	(4,807)
Pension liability adjustments, net of tax	466					(466)	466
Dividends declared	(301)			(301)			(301)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(587)			4,346		(4,933)	(587)
Noncontrolling Interest, Period Increase (Decrease)	24,882		9,437				9,437	15,445
Redemption value adjustment	776		776				(776)
Stock-based compensation	269		269				269
VIE distributions	1,054						0	1,054
Issuance of stock under 401(k) plan		29,414
Issuance of stock under 401(k) plan	(141)		123		(264)		(141)
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	1,341							(636)
Balance, Ending (in shares) at Mar. 31, 2019		59,946,387
Balance, Ending at Mar. 31, 2019	(289,671)		(528,305)	23,026	7,567	213,319	(284,393)	(5,278)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	(334)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest	428
Balance, Beginning (in shares) at Dec. 31, 2018		59,916,973
Balance, Beginning at Dec. 31, 2018	(270,097)		(519,498)	29,048	7,831	203,571	(279,048)	8,951
Net loss	(5,670)
Currency translation adjustment, net	1,044
Pension liability adjustments, net of tax	1,004
Redemption value adjustment	1,437
Balance, Ending (in shares) at Jun. 30, 2019		60,000,370
Balance, Ending at Jun. 30, 2019	(288,091)		(527,763)	29,751	7,082	207,996	(282,934)	(5,157)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	(599)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest	749
Balance, Beginning (in shares) at Mar. 31, 2019		59,946,387
Balance, Beginning at Mar. 31, 2019	(289,671)		(528,305)	23,026	7,567	213,319	(284,393)	(5,278)
Net loss	(6,677)			(6,424)			(6,424)
Currency translation adjustment, net	5,423					4,785	4,785	317
Temporary Equity, Foreign Currency Translation Adjustments	5,102
Pension liability adjustments, net of tax	538					(538)	538
Dividends declared	(301)			301			(301)
Redemption value adjustment	661		661				(661)
Stock-based compensation	286		286				286
VIE distributions	450							(450)
Issuance of stock under 401(k) plan		53,983
Issuance of stock under 401(k) plan	(318)		167		(485)		(318)
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	(6,412)							12
Balance, Ending (in shares) at Jun. 30, 2019		60,000,370
Balance, Ending at Jun. 30, 2019	(288,091)		(527,763)	29,751	7,082	207,996	(282,934)	(5,157)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	(265)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest	321
Balance, Beginning (in shares) at Dec. 31, 2019		60,283,212
Balance, Beginning at Dec. 31, 2019	(238,988)		(532,070)	74,334	4,234	218,651	(234,851)	(4,137)
Net loss				(25,486)			(25,486)
Currency translation adjustment, net						(32,004)	(32,004)	(1,782)
Temporary Equity, Foreign Currency Translation Adjustments	(33,786)
Pension liability adjustments, net of tax	1,308					1,308	1,308
Dividends declared	(302)			(302)			(302)
Stock Issued During Period, Shares, Restricted Stock Award, Gross		2,500
Stock-based compensation	490		468		22		490
Noncontrolling Interest, Decrease from Deconsolidation	559						0	559
Issuance of stock under 401(k) plan		76,280
Issuance of stock under 401(k) plan	(282)		(282)				(282)
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	(27,499)							(2,013)
Balance, Ending (in shares) at Mar. 31, 2020		60,361,992
Balance, Ending at Mar. 31, 2020	(178,922)		(532,820)	100,122	4,212	249,347	(179,139)	217
Balance, Beginning (in shares) at Dec. 31, 2019		60,283,212
Balance, Beginning at Dec. 31, 2019	(238,988)		(532,070)	74,334	4,234	218,651	(234,851)	(4,137)
Net loss	(32,142)
Currency translation adjustment, net	(32,772)
Pension liability adjustments, net of tax	1,348
Redemption value adjustment	0
Balance, Ending (in shares) at Jun. 30, 2020		60,602,294
Balance, Ending at Jun. 30, 2020	(176,657)		(531,577)	105,167	2,055	248,982	(175,373)	(1,284)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest	0
Balance, Beginning (in shares) at Mar. 31, 2020		60,361,992
Balance, Beginning at Mar. 31, 2020	(178,922)		(532,820)	100,122	4,212	249,347	(179,139)	217
Net loss	(4,643)			(5,045)			(5,045)
Currency translation adjustment, net	1,014					523	523	491
Temporary Equity, Foreign Currency Translation Adjustments	1,014
Pension liability adjustments, net of tax	40					40	40
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	(198)					(198)	(198)
Redemption value adjustment	0
Stock-based compensation	581		559		22		581
VIE distributions	608							608
Issuance of stock under 401(k) plan		237,802
Issuance of stock under 401(k) plan	(333)		1,802		(2,135)		(333)
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	(4,643)							402
Balance, Ending (in shares) at Jun. 30, 2020		60,602,294
Balance, Ending at Jun. 30, 2020	$ (176,657)		$ (531,577)	$ 105,167	$ 2,055	$ 248,982	$ (175,373)	$ (1,284)

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Value of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Adjustments to temporary equity resulting from foreign currency translation adjustments.

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No definition available.

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