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

9 Months Ended

Sep. 30, 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):

	Nine Months Ended September 30,
	2018		2017
Cash paid during the period for:
Interest	$	6,733	$	7,273
Income taxes	2,257		3,756
Non-cash items from investing and financing activities:
Purchases of computer equipment financed through capital leases	3,298		—
Investment in multi-client data library in accounts payable and accrued expenses	6,657		8,485