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Statement of Cash Flow Information
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Statement of Cash Flow Information
STATEMENT OF CASH FLOW INFORMATION
Cash and cash equivalents at December 31, 2017 and 2016 included $0.6 million and $0.5 million, respectively of restricted cash related to collateral on seismic operations bonds.
For purposes of the statement of cash flows, the Company considers all highly liquid investments or debt instruments with an original maturity of three months or less to be cash equivalents. The Company maintains its day-to-day operating cash and temporary excess cash with various banking institutions that, in turn, invest in time deposits and U.S. Treasury bills.
Income taxes paid during 2017, 2016 and 2015 were $0.8 million, $1.5 million and $0.3 million, respectively. In 2016 and 2015, the Company received income tax refunds of $5.1 million, and $1.0 million, respectively.
The Company had non-cash additions to its seismic data library comprised of the following (in thousands): 
 
Year Ended December 31,
 
2017
 
2016
 
2015
Non-monetary exchanges related to resale licensing
$
2,075

 
$
1,840

 
$
9,300

Non-monetary exchanges from underwriting of new data acquisition
—

 
408

 
—

Adjustment to prior year non-monetary exchanges
(11
)
 
—

 
(2
)
Non-monetary exchanges related to data processing and reproduction services
—

 
392

 
13

Total non-cash additions to seismic data library
$
2,064

 
$
2,640

 
$
9,311


Non-cash revenue consisted of the following (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Acquisition revenue on underwriting from non-monetary exchange contracts
$
279

 
$
129

 
$
168

Licensing revenue from specific data licenses and selections on non-monetary exchange contracts
1,250

 
3,179

 
6,747

Solutions and other revenue recognized from non-monetary exchange contracts
91

 
—

 
13

Total non-cash revenue
$
1,620

 
$
3,308

 
$
6,928