Supplemental Cash Flow Information and Non-Cash Activity (Tables)

6 Months Ended

Jun. 30, 2015

Supplemental Cash Flow Elements [Abstract]

Summary of Non-cash Items from Investing and Financing Activities

The following table is a summary of non-cash items from investing and financing activities (in thousands):

	Six Months Ended June 30,
	2015			2014
Cash paid during the period for:
Interest	$	7,843		$	8,803
Income taxes	$	9,649		$	7,326
Non-cash items from investing and financing activities:
Purchases of computer equipment financed through capital leases	$	1,178		$	4,780
Investment in multi-client data library financed through accounts payable	$	6,706		$	2,773
Transfer of inventory to property, plant, equipment and seismic rental equipment	$	15,936	(a)	$	2,308

^(a)  This transfer of inventory to property, plant, equipment and seismic rental equipment relates to ocean bottom seismic equipment manufactured by the Company to be deployed in the acquisition of ocean bottom seismic data.

Additionally, during the six months ended June 30, 2015, the Company purchased approximately $17.2 million of property, plant, equipment and seismic rental equipment, including approximately $14.3 million related to the manufacture of ocean bottom seismic equipment that will be used by the Ocean Bottom Services segment.