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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]  
Details of Supplemental Cash Flow Information
The following table provides information regarding supplemental cash flows (in thousands):
 
Six Months Ended June 30,
 
2018
 
2017
Cash Paid During the Period For:
 
 
 
Income taxes
$
4,343

 
$
7,542

Interest, net
$
2,199

 
$
1,624

Non-Cash Financing and Investing Transactions:
 
 
 
Employee stock purchase plan
$
261

 
$
281

Equipment acquired under capital leases
$
424

 
$
465

Shares tendered in payment of exercise price of stock options
$
46

 
$
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