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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of selected information for each business segment
Selected information regarding the Company’s segments are provided as follows:
 
Year Ended
December 31,
(in thousands)
2018
 
2017
 
2016
Revenues from external customers
 
 
 
 
 
U.S.
$
288,580

 
$
290,002

 
$
257,420

International
54,794

 
41,376

 
44,433

Total revenues from external customers
$
343,374

 
$
331,378

 
$
301,853

 
 
 
 
 
 
Revenues by product
 
 
 
 
 
DEFINITY
$
183,073

 
$
157,268

 
$
131,612

TechneLite
98,858

 
104,644

 
99,217

Other
61,443

 
69,466

 
71,024

Total revenues
$
343,374

 
$
331,378

 
$
301,853

 
 
 
 
 
 
Geographical revenues
 
 
 
 
 
U.S.
$
288,580

 
$
290,002

 
$
257,420

All other
54,794

 
41,376

 
44,433

Total revenues
$
343,374

 
$
331,378

 
$
301,853

 
 
 
 
 
 
Operating income
 
 
 
 
 
U.S.
$
56,327

 
$
49,239

 
$
46,909

International
8,161

 
2,614

 
9,679

Operating income
64,488

 
51,853

 
56,588

Interest expense
17,405

 
18,410

 
26,618

Debt retirement costs
—

 
—

 
1,896

Loss on extinguishment of debt
—

 
2,442

 
—

Other income
(2,465
)
 
(8,638
)
 
(220
)
Income before income taxes
$
49,548

 
$
39,639

 
$
28,294

 
 
 
 
 
 
Depreciation and amortization
 
 
 
 
 
U.S.
$
12,278

 
$
17,672

 
$
15,995

International
491

 
517

 
1,335

Total depreciation and amortization
$
12,769

 
$
18,189

 
$
17,330

 
December 31,
(in thousands)
2018
 
2017
Long-lived assets
 
 
 
U.S.
$
106,755

 
$
91,537

International
1,133

 
1,462

Total long-lived assets
$
107,888

 
$
92,999