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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Schedule of Selected Information for Each Operating Segment
Selected information regarding the Company’s segments is provided as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in thousands)
2018
 
2017
 
2018
 
2017
Revenues from external customers
 
 
 
 
 
 
 
U.S.
$
74,086

 
$
78,100

 
$
145,574

 
$
149,127

International
11,487

 
10,737

 
22,629

 
21,069

Total revenues from external customers
$
85,573

 
$
88,837

 
$
168,203

 
$
170,196

Operating income
 
 
 
 
 
 
 
U.S.
$
14,292

 
$
16,895

 
$
28,448

 
$
28,063

International
1,634

 
1,002

 
2,615

 
1,761

Total operating income
15,926

 
17,897

 
31,063

 
29,824

Interest expense
4,298

 
4,285

 
8,348

 
9,705

Loss on extinguishment of debt
—

 
—

 
—

 
2,161

Other income
(336
)
 
(552
)
 
(1,256
)
 
(1,129
)
Income before income taxes
$
11,964

 
$
14,164

 
$
23,971

 
$
19,087