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

3 Months Ended

Mar. 31, 2018

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,
	2018		2017
Cash paid during the period for:
Interest	$	1,039	$	206
Income taxes	546		819
Non-cash items from investing and financing activities:
Investment in multi-client data library in accounts payable and accrued expenses	—		1,654
Purchases of property, plant, and equipment financed through accounts payable	—		730