Segments (Tables)

9 Months Ended

Sep. 30, 2018

The following table presents revenue and gross margin by segment during the three and nine months ended September 30, 2018 and 2017 (in thousands):



	Contract Operations		Aftermarket Services		Total
Three months ended September 30, 2018
Revenue	$	169,509	$	62,863	$	232,372
Gross margin	100,453		12,820		113,273
Three months ended September 30, 2017
Revenue	$	153,524	$	44,329	$	197,853
Gross margin	81,573		5,843		87,416

Nine months ended September 30, 2018
Revenue	$	496,156	$	175,126	$	671,282
Gross margin	294,696		31,953		326,649
Nine months ended September 30, 2017
Revenue	$	454,622	$	131,098	$	585,720
Gross margin	256,331		19,271		275,602

The following table reconciles total gross margin to income (loss) before income taxes (in thousands):



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Total gross margin	$	113,273		$	87,416		$	326,649		$	275,602
Less:
Selling, general and administrative	26,298			29,108			80,455			81,823
Depreciation and amortization	43,779			47,463			131,565			142,483
Long-lived asset impairment	6,660			7,105			18,323			20,858
Restatement and other charges	396			566			(195		)	3,287
Restructuring and other charges	—			422			—			1,245
Interest expense	23,518			22,892			69,402			66,817
Debt extinguishment loss	—			—			2,450			291
Merger-related costs	182			—			9,993			—
Other income, net	(660		)	(2,716		)	(3,449		)	(4,472		)
Income (loss) before income taxes	$	13,100		$	(17,424	)	$	18,105		$	(36,730	)