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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2019
Segment Reporting [Abstract]  
Schedule of segment information
Selected information regarding the Company’s segments is provided as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in thousands)
2019
 
2018
 
2019
 
2018
Revenues from external customers
 
 
 
 
 
 
 
U.S.
$
74,650

 
$
70,255

 
$
225,274

 
$
215,829

International
11,126

 
18,645

 
32,717

 
41,274

Total revenues from external customers
$
85,776

 
$
88,900

 
$
257,991

 
$
257,103

Operating income
 
 
 
 
 
 
 
U.S.
$
6,389

 
$
12,897

 
$
33,662

 
$
41,345

International
2,128

 
3,585

 
5,561

 
6,200

Total operating income
8,517

 
16,482

 
39,223

 
47,545

Interest expense
2,356

 
4,446

 
11,491

 
12,794

Loss on extinguishment of debt
—

 
—

 
3,196

 
—

Other expense (income)
804

 
(799
)
 
(1,695
)
 
(2,055
)
Income before income taxes
$
5,357

 
$
12,835

 
$
26,231

 
$
36,806