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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Schedule of segment information
Selected information regarding the Company’s segments is provided as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in thousands)
2019
 
2018
 
2019
 
2018
Revenues from external customers
 
 
 
 
 
 
 
U.S.
$
75,190

 
$
74,086

 
$
150,624

 
$
145,574

International
10,515

 
11,487

 
21,591

 
22,629

Total revenues from external customers
$
85,705

 
$
85,573

 
$
172,215

 
$
168,203

Operating income
 
 
 
 
 
 
 
U.S.
$
12,689

 
$
14,292

 
$
27,273

 
$
28,448

International
1,848

 
1,634

 
3,433

 
2,615

Total operating income
14,537

 
15,926

 
30,706

 
31,063

Interest expense
4,543

 
4,298

 
9,135

 
8,348

Loss on extinguishment of debt
3,196

 
—

 
3,196

 
—

Other income
(1,312
)
 
(336
)
 
(2,499
)
 
(1,256
)
Income before income taxes
$
8,110

 
$
11,964

 
$
20,874

 
$
23,971