Reportable Segments (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Revenue and other financial information by reportable segment

The following table presents revenue and other financial information by reportable segment during the three months ended March 31, 2016 and 2015 (in thousands):

Three Months Ended	Contract Operations		Aftermarket Services		Reportable Segments Total
March 31, 2016:
Revenue from external customers	$	176,239	$	37,056	$	213,295
Gross margin	108,060		6,694		114,754
March 31, 2015:
Revenue from external customers	$	202,261	$	50,612	$	252,873
Gross margin	119,582		9,835		129,417

Reconciliation of net income (loss) to gross margin

	Three Months Ended March 31,
	2016			2015
Total gross margin	$	114,754		$	129,417
Less:
Selling, general and administrative	34,651			32,568
Depreciation and amortization	53,927			57,013
Long-lived asset impairment	9,860			8,153
Restructuring and other charges	8,065			—
Interest expense	20,300			26,791
Other income, net	(1,989		)	(550		)
Income (loss) before income taxes	$	(10,060	)	$	5,442