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

3 Months Ended

Mar. 31, 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):

	Three Months Ended March 31,
	2015			2014
Cash paid during the period for:
Interest	$	497		$	912
Income taxes	$	5,041		$	5,020
Non-cash items from investing and financing activities:
Purchases of computer equipment financed through capital leases	$	1,178		$	1,952
Investment in multi-client data library financed through accounts payable	$	7,018		$	—
Transfer of inventory to property, plant, equipment and seismic rental equipment	$	8,485	(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.