CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenues		$ 859,111	$ 1,062,388
Costs and expenses:
Cost of operations		698,853	1,192,032
Selling, general and administrative expenses		151,069	204,706
Goodwill and other intangible asset impairment		0	40,046
Advisory fees and settlement costs		27,943	18,625
Restructuring activities and spin-off transaction costs		11,707	16,758
Research and development costs		2,861	3,780
(Gain) loss on asset disposals, net		(3,940)	1,438
Total costs and expenses		888,493	1,477,385
Equity in income and impairment of investees		0	(11,603)
Operating loss		(29,382)	(426,600)
Other (expense) income:
Interest expense		(94,901)	(49,613)
Interest income		923	244
Loss on debt extinguishment		(3,969)	(49,241)
Gain (loss) on sale of business		(3,601)	39,815
Benefit plans, net		22,800	(42,123)
Foreign exchange		(16,602)	(28,542)
Other – net		285	259
Total other expense		(95,065)	(129,201)
Loss before income tax expense		(124,447)	(555,801)
Income tax expense		5,286	102,224
Loss from continuing operations		(129,733)	(658,025)
Income (loss) from discontinued operations, net of tax		694	(66,832)
Net loss		(129,039)	(724,857)
Net loss (income) attributable to non-controlling interest		7,065	(435)
Net loss attributable to stockholders		$ (121,974)	$ (725,292)
Basic and diluted loss per share - continuing operations (in dollars per share)		$ (3.89)	$ (47.62)
Basic and diluted earnings (loss) per share - discontinued operations (in dollars per share)		0.02	(4.83)
Basic and diluted loss per share (in dollars per share)		$ (3.87)	$ (52.45)
Shares used in the computation of (loss) earnings per share:
Basic and diluted (in shares)	[1]	31,514	13,829

[1] Basic and diluted shares reflect the bonus element for the 2019 Rights Offering on July 23, 2019 as described in Note 3 and the one-for-ten reverse stock split on July 24, 2019 as described in Note 1.