Business Segment, Geographic and Major Customer Information (Tables)

9 Months Ended

Sep. 30, 2012

Business Segment, Geographic and Major Customer Information [Abstract]

Financial information regarding reportable segments

	Chemicals		Drilling		Artificial Lift		Corporate			Total
As of and for the Three Months Ended September 30,
2012
Net revenue from external customers	$	44,189	$	30,424	$	4,015	$	—		$	78,628
Gross margin		20,774		11,252		1,817		—			33,843
Income (loss) from operations		16,530		5,329		1,384		(8,650	)		14,593
Depreciation and amortization		460		2,277		54		177			2,968
Total assets		53,076		122,533		10,563		31,963			218,135
Capital expenditures		733		2,384		5		2,643			5,765
2011
Net revenue from external customers	$	43,639	$	26,963	$	4,456	$	—		$	75,058
Gross margin		17,393		11,091		2,233		—			30,717
Income (loss) from operations		13,795		5,585		1,811		(5,086	)		16,105
Depreciation and amortization		409		2,056		50		53			2,568
Total assets		56,880		111,804		10,162		32,182			211,028
Capital expenditures		928		945		38		403			2,314

	Chemicals		Drilling		Artificial Lift		Corporate			Total
As of and for the Nine Months Ended September 30,
2012
Net revenue from external customers	$	137,827	$	89,214	$	9,085	$	—		$	236,126
Gross margin		61,856		34,764		3,699		—			100,319
Income (loss) from operations		50,005		17,320		2,284		(22,679	)		46,930
Depreciation and amortization		1,321		6,738		148		261			8,468
Total assets		53,076		122,533		10,563		31,963			218,135
Capital expenditures		2,896		7,724		73		4,550			15,243
2011
Net revenue from external customers	$	99,707	$	74,068	$	10,106	$	—		$	183,881
Gross margin		39,705		30,844		3,557		—			74,106
Income (loss) from operations		30,586		16,187		2,205		(15,683	)		33,295
Depreciation and amortization		1,189		5,979		155		209			7,532
Total assets		56,880		111,804		10,162		32,182			211,028
Capital expenditures		1,090		3,900		48		933			5,971

Revenue by geographic location

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
U.S.	$	68,512	$	63,906	$	206,394	$	159,756
Other countries		10,116		11,152		29,731		24,125
Total	$	78,628	$	75,058	$	236,125	$	183,881

Summary of revenue from major customers

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Customer A		16.6	%		14.6	%		15.2	%		13.7	%
Customer B		9.5	%		12.8	%		10.4	%		11.7	%
Customer C		12.1	%		5.8	%		9.8	%		4.5	%