Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenues	$ 146,245	$ 264,685	$ 365,939	$ 515,296
Costs and expenses:
Cost of revenues (exclusive of depreciation and amortization expense presented below)	128,083	208,112	325,685	407,990
Selling, general and administrative expense	23,992	31,484	50,116	61,592
Depreciation and amortization expense	24,646	31,883	51,055	63,434
Impairments of goodwill	0	0	406,056	0
Impairments of fixed assets	2,992	0	8,190	0
Other operating income, net	(134)	(399)	(27)	(485)
Costs and expenses	179,579	271,080	841,075	532,531
Operating loss	(33,334)	(6,395)	(475,136)	(17,235)
Interest expense, net	(4,179)	(4,617)	(7,683)	(9,369)
Other income, net	5,994	1,009	6,768	1,676
Loss before income taxes	(31,519)	(10,003)	(476,051)	(24,928)
Income tax benefit	6,893	263	46,384	540
Net loss	$ (24,626)	$ (9,740)	$ (429,667)	$ (24,388)
Net loss per share:
Basic (in dollars per share)	$ (0.41)	$ (0.16)	$ (7.19)	$ (0.41)
Diluted (in dollars per share)	$ (0.41)	$ (0.16)	$ (7.19)	$ (0.41)
Weighted average number of common shares outstanding:
Basic (in shares)	59,839	59,406	59,747	59,332
Diluted (in shares)	59,839	59,406	59,747	59,332
Products
Revenues:
Revenues	$ 82,643	$ 124,965	$ 185,623	$ 241,293
Costs and expenses:
Cost of revenues (exclusive of depreciation and amortization expense presented below)	68,088	95,289	157,834	184,557
Services
Revenues:
Revenues	63,602	139,720	180,316	274,003
Costs and expenses:
Cost of revenues (exclusive of depreciation and amortization expense presented below)	$ 59,995	$ 112,823	$ 167,851	$ 223,433