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

6 Months Ended

Jun. 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):

	Six Months Ended June 30,
	2018		2017
Cash paid during the period for:
Interest	$	6,620	$	7,075
Income taxes	1,354		2,364
Non-cash items from investing and financing activities:
Investment in multi-client data library in accounts payable and accrued expenses	—		4,561