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SUPPLEMENTAL CASH FLOW INFORMATION
 12 Months Ended
Dec. 31, 2018
SUPPLEMENTAL CASH FLOW INFORMATION
21. SUPPLEMENTAL CASH FLOW INFORMATION
Supplemental cash flow information was as follows:
 
Years Ended December 31,
 
2018
 
 
2017
 
 
2016
 
Interest paid
 
$
3,065
 
 
$
5,773
 
 
$
3,362
 
Income taxes net of refunds
 
$
115,301
 
 
$
48,056
 
 
$
99,006
 
Common stock issued for Alert Labs Inc.
 
$
6,846
 
 
 
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