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Supplemental Cash Flow Information and Non-Cash Activity Supplemental Cash Flow Information and Non-Cash Activity
 9 Months Ended
Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information and Non-cash Activity
Supplemental Cash Flow Information and Non-cash Activity
A summary of non-cash items from investing and financing activities is as follows (in thousands):
 
Nine Months Ended September 30,
 
2014
 
2013
Cash paid during the period for:
 
 
 
Interest
$
9,087

 
$
2,042

Income taxes
$
12,008

 
$
13,778

Non-cash items from investing and financing activities:
 
 
 
Purchases of computer equipment financed through capital leases
$
5,768

 
$
5,962

Leasehold improvement paid by landlord
$
—

 
$
5,000

Conversion of investment in a convertible note to equity
$
3,151

 
$
6,765

Transfer of inventory to property, plant, equipment and seismic rental equipment
$
3,039

 
$
1,471

Investment in multi-client data library financed through trade payables
$
1,298

 
$
—

Purchases of property, plant, and equipment and seismic rental equipment financed through accounts payable
$
—

 
$
835