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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Supplemental cash flow information
The table below provides supplemental cash flow information:
 
Year ended December 31,
 
2018
 
2017
 
2016
Cash paid:
 

 
 

 
 

Income taxes
$
92,526

 
$
387,159

 
$
339,411

Interest
$
488,974

 
$
424,547

 
$
406,987

Non-cash investing and financing activities:
 

 
 

 
 

Fixed assets under capital lease obligations
$
8,828

 
$
48,378

 
$
28,127