Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenues	$ 134,759	$ 263,697	$ 500,698	$ 778,993
Costs and expenses:
Cost of revenues (exclusive of depreciation and amortization expense presented below)	120,611	201,090	446,296	609,080
Selling, general and administrative expense	21,389	31,935	71,505	93,527
Depreciation and amortization expense	24,251	31,366	75,306	94,800
Impairments of goodwill	0	0	406,056	0
Impairments of fixed assets	0	33,697	8,190	33,697
Other operating expense (income), net	(652)	519	(679)	34
Costs and expenses	165,599	298,607	1,006,674	831,138
Operating loss	(30,840)	(34,910)	(505,976)	(52,145)
Interest expense, net	(3,549)	(4,352)	(11,232)	(13,721)
Other income, net	6,744	1,190	13,512	2,866
Loss before income taxes	(27,645)	(38,072)	(503,696)	(63,000)
Income tax benefit	7,676	6,204	54,060	6,744
Net loss	$ (19,969)	$ (31,868)	$ (449,636)	$ (56,256)
Net loss per share:
Basic (in dollars per share)	$ (0.33)	$ (0.54)	$ (7.52)	$ (0.95)
Diluted (in dollars per share)	$ (0.33)	$ (0.54)	$ (7.52)	$ (0.95)
Weighted average number of common shares outstanding:
Basic (in shares)	59,871	59,423	59,788	59,362
Diluted (in shares)	59,871	59,423	59,788	59,362
Products
Revenues:
Revenues	$ 72,598	$ 122,067	$ 258,221	$ 363,360
Costs and expenses:
Cost of revenues (exclusive of depreciation and amortization expense presented below)	66,789	90,796	224,623	275,353
Services
Revenues:
Revenues	62,161	141,630	242,477	415,633
Costs and expenses:
Cost of revenues (exclusive of depreciation and amortization expense presented below)	$ 53,822	$ 110,294	$ 221,673	$ 333,727