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

3 Months Ended

Mar. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Summary of Non-cash Items from Investing and Financing Activities

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

	Three Months Ended March 31,
	2016			2015
Cash paid during the period for:
Interest	$	154		$	497
Income taxes (refunds)	(762		)	5,041
Non-cash items from investing and financing activities:
Purchases of computer equipment financed through capital leases	—			1,178
Investment in multi-client data library financed through accounts payable	3,885			7,018
Purchases of property, plant, and equipment and seismic rental equipment financed through accounts payable	179			—
Transfer of inventory to property, plant, equipment and seismic rental equipment	—			8,485