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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2019
Segment Reporting [Abstract]  
Schedule of segment information
Selected information regarding the Company’s segments is provided as follows:
 
Three Months Ended
March 31,
(in thousands)
2019
 
2018
Revenues from external customers
 
 
 
U.S.
$
75,434

 
$
71,488

International
11,076

 
11,142

Total revenues from external customers
$
86,510

 
$
82,630

Operating income
 
 
 
U.S.
$
14,584

 
$
14,156

International
1,585

 
981

Total operating income
16,169

 
15,137

Interest expense
4,592

 
4,050

Other income
(1,187
)
 
(920
)
Income before income taxes
$
12,764

 
$
12,007