CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands		Total	Common Stock	Capital In Excess of Par Value	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018	[1]		16,879,000
Stockholders' equity, beginning balance at Dec. 31, 2018		$ (277,297)	$ 1,748	$ 1,047,062	$ (105,590)	$ (1,217,914)	$ (11,432)	$ 8,829
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(49,866)				(49,765)		(101)
Currency translation adjustments		10,239					10,260	(21)
Derivative financial instruments		(954)					(954)
Defined benefit obligations		(356)					(356)
Stock-based compensation charges (in shares)	[1]		7,000
Stock-based compensation charges		382		404	(22)
Ending balance (in shares) at Mar. 31, 2019	[1]		16,886,000
Stockholders' equity, ending balance at Mar. 31, 2019		(317,852)	$ 1,748	1,047,466	(105,612)	(1,267,679)	(2,482)	8,707
Beginning balance (in shares) at Dec. 31, 2018	[1]		16,879,000
Stockholders' equity, beginning balance at Dec. 31, 2018		(277,297)	$ 1,748	1,047,062	(105,590)	(1,217,914)	(11,432)	8,829
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(134,497)
Ending balance (in shares) at Sep. 30, 2019	[1]		46,341,000
Stockholders' equity, ending balance at Sep. 30, 2019		(290,077)	$ 4,694	1,142,208	(105,634)	(1,352,274)	12,711	8,218
Beginning balance (in shares) at Mar. 31, 2019	[1]		16,886,000
Stockholders' equity, beginning balance at Mar. 31, 2019		(317,852)	$ 1,748	1,047,466	(105,612)	(1,267,679)	(2,482)	8,707
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(27,641)				(27,640)		(1)
Currency translation adjustments		(5,109)					(4,803)	(306)
Derivative financial instruments		(211)					(211)
Defined benefit obligations		(514)					(514)
Stock-based compensation charges (in shares)	[1]		2,000
Stock-based compensation charges		204		205	(1)
Conversions of stock		2,022		2,022
Warrants		6,066		6,066
Ending balance (in shares) at Jun. 30, 2019	[1]		16,888,000
Stockholders' equity, ending balance at Jun. 30, 2019		(343,035)	$ 1,748	1,055,759	(105,613)	(1,295,319)	(8,010)	8,400
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(56,990)				(56,955)		(35)
Currency translation adjustments		21,556					21,433	123
Derivative financial instruments		(197)					(197)
Defined benefit obligations		(515)					(515)
Stock-based compensation charges (in shares)	[1]		66,000
Stock-based compensation charges		1,211	$ 7	1,225	(21)
Rights Offering (in shares)	[1]		13,922,000
Rights Offering		41,768	$ 1,392	40,376
Last Out Term Loan principal value exchanged for common stock (in shares)	[1]		15,465,000
Conversions of stock		46,395	$ 1,547	44,848
Dividends to non-controlling interest		(270)						(270)
Ending balance (in shares) at Sep. 30, 2019	[1]		46,341,000
Stockholders' equity, ending balance at Sep. 30, 2019		$ (290,077)	$ 4,694	1,142,208	(105,634)	(1,352,274)	12,711	8,218
Beginning balance (in shares) at Dec. 31, 2019		46,374,000	46,374,000
Stockholders' equity, beginning balance at Dec. 31, 2019		$ (294,939)	$ 4,699	1,142,614	(105,707)	(1,339,888)	1,926	1,417
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(31,622)				(31,526)		(96)
Currency translation adjustments		2,322					2,380	(58)
Defined benefit obligations		(246)					(246)
Stock-based compensation charges (in shares)			33,000
Stock-based compensation charges		871	$ 4	876	(9)
Dividends to non-controlling interest		(36)						(36)
Ending balance (in shares) at Mar. 31, 2020			46,407,000
Stockholders' equity, ending balance at Mar. 31, 2020		$ (323,650)	$ 4,703	1,143,490	(105,716)	(1,371,414)	4,060	1,227
Beginning balance (in shares) at Dec. 31, 2019		46,374,000	46,374,000
Stockholders' equity, beginning balance at Dec. 31, 2019		$ (294,939)	$ 4,699	1,142,614	(105,707)	(1,339,888)	1,926	1,417
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		$ (15,313)
Ending balance (in shares) at Sep. 30, 2020		52,006,000	52,006,000
Stockholders' equity, ending balance at Sep. 30, 2020		$ (320,778)	$ 4,760	1,157,811	(105,985)	(1,354,794)	(23,443)	873
Beginning balance (in shares) at Mar. 31, 2020			46,407,000
Stockholders' equity, beginning balance at Mar. 31, 2020		(323,650)	$ 4,703	1,143,490	(105,716)	(1,371,414)	4,060	1,227
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(18,246)				(18,104)		(142)
Currency translation adjustments		(4,058)					(4,095)	37
Defined benefit obligations		(246)					(246)
Stock-based compensation charges		922		923	(1)
Equitized guarantee fee payment (in shares)			1,713,000
Equitized guarantee fee payment		3,900	$ 17	3,883
Equitized Last Out Term Loan interest payment (in shares)			1,192,000
Equitized Last Out Term Loan interest payment		2,715	$ 12	2,703
Dividends to non-controlling interest		(37)						(37)
Ending balance (in shares) at Jun. 30, 2020			49,312,000
Stockholders' equity, ending balance at Jun. 30, 2020		(338,700)	$ 4,732	1,150,999	(105,717)	(1,389,518)	(281)	1,085
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		34,555				34,724		(169)
Currency translation adjustments		(22,922)					(22,916)	(6)
Defined benefit obligations		(246)					(246)
Stock-based compensation charges (in shares)			360,000
Stock-based compensation charges		1,256	$ 4	1,520	(268)
Equitized Last Out Term Loan interest payment (in shares)			2,334,000
Equitized Last Out Term Loan interest payment		5,316	$ 24	5,292
Dividends to non-controlling interest		$ (37)						(37)
Ending balance (in shares) at Sep. 30, 2020		52,006,000	52,006,000
Stockholders' equity, ending balance at Sep. 30, 2020		$ (320,778)	$ 4,760	$ 1,157,811	$ (105,985)	$ (1,354,794)	$ (23,443)	$ 873

[1] Common stock shares reflect the one-for-ten reverse stock split on July 24, 2019.