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

12 Months Ended

Dec. 31, 2015

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information and Non-cash Activity

Supplemental disclosure of cash flow information follows (in thousands):

	Years Ended December 31,
	2015			2014		2013
Cash paid during the period for:
Interest	$	15,441		$	16,582	$	9,576
Income taxes	8,163			16,124		15,872
Non-cash items from investing and financing activities:
Purchase of computer equipment financed through capital leases	1,178			12,153		6,455
Leasehold improvement paid by landlord	—			—		5,000
Conversion of the Company's investment in a convertible note to equity	—			3,151		6,765
Transfer of inventory to property, plant and equipment	15,936		(a)	10,149		1,422
Investment in multi-client data library financed through trade payables	8,939			—		—
Purchases of property, plant, and equipment and seismic rental equipment financed through accounts payable	—			472		909
Sale of rental equipment financed with a note receivable	—			—		3,636