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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of Selected Information for Each Operating Segment
Selected information for each operating segment is as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in thousands)
2017
 
2016
 
2017
 
2016
Revenues from external customers
 
 
 
 
 
 
 
U.S.
$
69,579

 
$
62,621

 
$
218,706

 
$
192,687

International
10,362

 
10,442

 
31,431

 
34,816

Total revenues from external customers
$
79,941

 
$
73,063

 
$
250,137

 
$
227,503

Operating income
 
 
 
 
 
 
 
U.S.
$
12,243

 
$
11,649

 
$
40,306

 
$
35,941

International
579

 
946

 
2,340

 
8,506

Total operating income
12,822

 
12,595

 
42,646

 
44,447

Interest expense
4,442

 
6,792

 
14,147

 
20,799

Debt retirement costs
—

 
1,415

 
—

 
1,415

Loss on extinguishment of debt
—

 
—

 
2,161

 
—

Other (income) expense
(908
)
 
148

 
(2,037
)
 
(317
)
Income before income taxes
$
9,288

 
$
4,240

 
$
28,375

 
$
22,550