CONSOLIDATED STATEMENT OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) shares in Thousands, $ in Thousands		Total	Last Out Term Loan	Last Out Term Loan Tranche A-3	Common Stock		Common Stock Last Out Term Loan	Capital In Excess of Par Value	Capital In Excess of Par Value Last Out Term Loan	Capital In Excess of Par Value Last Out Term Loan Tranche A-3	Treasury Stock	Treasury Stock Last Out Term Loan	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018	[1]				16,879
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) income		(129,039)											(121,974)		(7,065)
Currency translation adjustments		16,502												16,577	(75)
Derivative financial instruments		(1,362)												(1,362)
Defined benefit obligations		(1,857)												(1,857)
Stock-based compensation (in shares)	[1]				108
Stock-based compensation		2,967			$ 12			3,072			(117)
Rights offering, net		40,936			$ 1,392			39,544
Last Out Term Loan principal value exchanged for common stock (in shares)	[1]						15,465
Conversions of stock			$ 46,395	$ 2,022			$ 1,547		$ 44,848	$ 2,022		$ 0
Warrants		6,066						6,066
Dividends to non-controlling interest		$ (272)													(272)
Ending balance (in shares) at Dec. 31, 2019		46,374			46,374	[1]
Ending 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]
Rights offering, net (in shares)	[1]				13,922
Net (loss) income		(10,297)											(10,318)		21
Currency translation adjustments		(53,310)												(53,318)	8
Defined benefit obligations		(998)												(998)
Stock-based compensation (in shares)	[1]				460
Stock-based compensation		4,274			$ 9			4,548			(283)
Equitized guarantee fee payment (in shares)	[1]				1,713
Equitized guarantee fee payment		3,900			$ 17			3,883
Equitized Last Out Term Loan interest payment (in shares)	[1]				5,905
Equitized Last Out Term Loan interest payment		13,450			$ 59			13,391
Dividends to non-controlling interest		$ (342)													(342)
Ending balance (in shares) at Dec. 31, 2020		54,452			54,452	[1]
Ending balance at Dec. 31, 2020		$ (338,262)			$ 4,784			$ 1,164,436			$ (105,990)		$ (1,350,206)	$ (52,390)	$ 1,104

[1] Issued and outstanding common shares and treasury stock shares reflect the one-for-ten reverse stock split on July 24, 2019 as described in Note 1