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

6 Months Ended

Jun. 30, 2014

Supplemental Cash Flow Elements [Abstract]

Summary of Non-cash Items from Investing and Financing Activities

A summary of non-cash items from investing and financing activities is as follows (in thousands):

	Six Months Ended June 30,
	2014		2013
Cash paid during the period for:
Interest	$	8,803	$	1,662
Income taxes	$	7,326	$	11,146
Non-cash items from investing and financing activities:
Purchases of computer equipment financed through capital leases	$	4,780	$	2,465
Leasehold improvement paid by landlord	$	—	$	1,738
Conversion of investment in a convertible note to equity	$	—	$	6,765
Transfer of inventory to property, plant, equipment and seismic rental equipment	$	2,308	$	—
Investment in multi-client data library financed through trade payables	$	2,773	$	—