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Segment Information
 6 Months Ended
Jun. 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
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