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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures
Supplemental cash flows and non-cash transactions were as follows for the periods indicated (in thousands):
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
 
 
 
 
 
Cash paid for interest
$
447

 
$
180

 
$
559

Cash paid for income taxes, net of refunds
8,754

 
20,499

 
28,004

 
 
 
 
 
 
Non-cash transactions:
 
 
 
 
 
Change in accounts payable related to capital expenditures
$
1,658

 
$
(3,534
)
 
$
(3,479
)
Insurance premium financed by note payable
—

 
7,630

 
—

Value of shares issued for Blackhawk Group acquisition
144,047

 
—

 
—