Selected Quarterly Information (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Information (Unaudited)

Selected Quarterly Information — (Unaudited)

A summary of selected quarterly information is as follows (in thousands, except per share amounts):

	Three Months Ended
Year Ended December 31, 2012	March 31			June 30			September 30			December 31
Service revenues	$	66,634		$	72,844		$	93,023		$	122,082
Product revenues	45,076			32,370			43,300			50,988
Total net revenues	111,710			105,214			136,323			173,070
Gross profit	41,156			45,943			55,958			72,744
Income from operations	11,643			12,972			25,049			24,863
Interest expense, net	(1,518		)	(1,364		)	(1,237		)	(1,146		)
Equity in earnings (losses) of INOVA Geophysical	2,468			3,777			(1,684		)	(4,264		)
Other income (expense)	(686		)	895			(936		)	17,851
Income tax expense	3,445			4,184			6,037			10,191
Net income attributable to noncontrolling interests	113			281			42			53
Preferred stock dividends	338			338			338			338
Net income applicable to common shares	$	8,237		$	12,039		$	14,859		$	26,828
Net income per share:
Basic	$	0.05		$	0.08		$	0.10		$	0.17
Diluted	$	0.05		$	0.08		$	0.09		$	0.17

	Three Months Ended
Year Ended December 31, 2011	March 31			June 30			September 30			December 31
Service revenues	$	58,165		$	49,516		$	73,894		$	84,011
Product revenues	32,387			39,016			41,760			75,872
Total net revenues	90,552			88,532			115,654			159,883
Gross profit	31,139			33,631			44,058			64,617
Income from operations	6,071			8,800			18,496			33,428
Interest expense, net	(1,615		)	(1,187		)	(1,382		)	(1,600		)
Equity in losses of INOVA Geophysical	(860		)	(4,173		)	(4,811		)	(13,018		)
Other income (expense)	(2,999		)	497			199			(1,144		)
Income tax expense	147			1,085			3,484			5,420
Net income attributable to noncontrolling interests	25			44			34			105
Preferred stock dividends	338			338			338			338
Net income applicable to common shares	$	137		$	2,558		$	8,714		$	12,013
Net income per share:
Basic	$	—		$	0.02		$	0.06		$	0.08
Diluted	$	—		$	0.02		$	0.06		$	0.08