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Segment Information
 9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Segment Information
Segment Information
The Company reports two operating segments, U.S. and International, based on geographic customer base. The results of these operating segments are regularly reviewed by the Company’s chief operating decision maker, the President and Chief Executive Officer. The Company’s segments derive revenues through the manufacture, marketing, selling and distribution of medical imaging products, focused primarily on cardiovascular diagnostic imaging. All goodwill has been allocated to the U.S. operating segment. The Company does not identify or allocate assets to its segments.
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