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Supplemental Cash Flow Information (Tables)
6 Months Ended
Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
Supplemental cash flows and non-cash transactions were as follows for the periods indicated (in thousands):

 
Six Months Ended
 
June 30,
 
2017
 
2016
 
 
 
 
Cash paid for federal and state taxes
$
225

 
$
1,845

 
 
 
 
Non-cash transactions:
 
 
 
Change in accounts payable related to property and equipment additions
455

 
340