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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss) attributable to Amphastar Pharmaceuticals, Inc.	$ 29,548	$ 3,919	$ 42,356	$ 7,676
Other comprehensive income (loss) attributable to Amphastar Pharmaceuticals, Inc., net of income taxes
Reclassification of adjustment for amounts included in net income	(362)		(362)
Foreign currency translation adjustment	(984)	695	(2,194)	209
Total other comprehensive income (loss) attributable to Amphastar Pharmaceuticals, Inc.	(1,346)	695	(2,556)	209
Total comprehensive income (loss) attributable to Amphastar Pharmaceuticals, Inc.	$ 28,202	$ 4,614	$ 39,800	$ 7,885

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