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	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2017	[1]				4,407
Stockholders' equity, beginning balance at Dec. 31, 2017		$ 190,703			$ 499			$ 800,968		$ (104,785)	$ (492,150)	$ (22,429)	$ 8,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(724,857)									(725,292)		435
Revenue recognition standard adoption		(472)									(472)
Currency translation adjustments		16,797										17,003	(206)
Derivative financial instruments		(375)										(375)
Defined benefit obligations		(5,593)										(5,593)
Available-for-sale investments		(38)										(38)
Rights offering, net		245,089			$ 1,243			243,846
Stock-based compensation charges (in shares)	[1]				46
Stock-based compensation charges		$ 1,449			$ 6			2,248		(805)
Ending balance (in shares) at Dec. 31, 2018		16,879			16,879	[1]
Stockholders' equity, ending 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]
Rights offering, net (in shares)	[1]				12,426
Net loss		(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)
Rights offering, net		40,936			$ 1,392			39,544
Stock-based compensation charges (in shares)	[1]				108
Stock-based compensation charges		2,967			$ 12			3,072		(117)
Last Out Term Loan principal value exchanged for common stock (in shares)	[1]						15,465
Conversions		6,066	$ 46,395	$ 2,022			$ 1,547	6,066	$ 44,848
Dividends to non-controlling interest		$ (272)											(272)
Ending balance (in shares) at Dec. 31, 2019		46,374			46,374	[1]
Stockholders' equity, 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

[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