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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures
Supplemental cash flow information is as follows (in thousands):
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Cash paid for:
 
 
 
 
 
 
Interest
 
$
4,072

 
$
4,338

 
$
4,306

Income taxes
 
9,838

 
5,485

 
3,863

 
 
$
13,910

 
$
9,823

 
$
8,169

 
 
 
 
 
 
 
Noncash investing and financing activities:
 
 
 
 
 
 
Shares issued as payment of contingent consideration
 
$
4,678

 
$
2,012

 
$
1,570

 
 
$
4,678

 
$
2,012

 
$
1,570