Segment Information

12 Months Ended

Dec. 31, 2018

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 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