CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenues	$ 225,310	$ 116,588	$ 596,677	$ 449,665
Cost of revenues (exclusive of items shown below)	170,621	100,872	462,633	362,853
Selling, general and administrative expenses	31,446	32,376	91,444	97,681
Impairment and other charges	0	0	0	207,175
Depreciation and amortization	18,106	18,655	53,775	77,521
Gain on disposition of assets, net	(2,837)	(3,563)	(7,408)	(7,576)
Operating income (loss)	7,974	(31,752)	(3,767)	(287,989)
Interest expense	(1,280)	(73)	(1,763)	(257)
Interest income	15	29	47	431
Other income (expense), net	448	769	1,571	(1,020)
Income (loss) before income taxes	7,157	(31,027)	(3,912)	(288,835)
Income tax provision (benefit)	1,891	(14,590)	1,210	(86,882)
Net income (loss)	$ 5,266	$ (16,437)	$ (5,122)	$ (201,953)
Earnings(loss) per share
Basic (in dollars per share)	$ 0.02	$ (0.08)	$ (0.02)	$ (0.95)
Diluted (in dollars per share)	$ 0.02	$ (0.08)	$ (0.02)	$ (0.95)