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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2018
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)
2018
 
2017
 
2018
 
2017
Revenues from external customers
 
 
 
 
 
 
 
U.S.
$
70,255

 
$
69,579

 
$
215,829

 
$
218,706

International
18,645

 
10,362

 
41,274

 
31,431

Total revenues from external customers
$
88,900

 
$
79,941

 
$
257,103

 
$
250,137

Operating income
 
 
 
 
 
 
 
U.S.
$
12,897

 
$
12,243

 
$
41,345

 
$
40,306

International
3,585

 
579

 
6,200

 
2,340

Total operating income
16,482

 
12,822

 
47,545

 
42,646

Interest expense
4,446

 
4,442

 
12,794

 
14,147

Loss on extinguishment of debt
—

 
—

 
—

 
2,161

Other income
(799
)
 
(908
)
 
(2,055
)
 
(2,037
)
Income before income taxes
$
12,835

 
$
9,288

 
$
36,806

 
$
28,375