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Additional Cash Flow Information
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Additional Cash Flow Information
ADDITIONAL CASH FLOW INFORMATION
The following presents information about cash paid for interest, income taxes and other non-cash financing activities for the years ended December 31, 2017, 2016 and 2015 (in thousands):  
 
2017
 
2016
 
2015
Cash paid during the year for:
 
 
 
 
 
Interest
$
11,456

 
$
11,033

 
$
7,668

Income taxes
$
130,226

 
$
129,540

 
$
99,754

Non-cash financing activities:
 
 
 
 
 
Assets acquired under capital lease obligations
$
1,252

 
$
1,914

 
$
3,847