CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 834,289	$ 866,199	$ 824,444
Costs and expenses:
Cost of goods sold	620,556	609,568	576,304
Selling, general and administrative	123,853	138,553	141,893
Gain on disposal of Non-core Products, net	(33,599)
Design and development	52,198	51,074	48,877
Operating income	71,281	67,004	57,370
Interest expense, net	4,324	4,720	5,783
Equity in earnings of investee	(1,578)	(2,038)	(1,636)
Other income (loss), net	142	(736)	641
Income before income taxes	68,393	65,058	52,582
Provision for income taxes	8,102	11,210	7,533
Net income	60,291	53,848	45,049
Net loss attributable to noncontrolling interest			(130)
Net income attributable to Stoneridge, Inc.	$ 60,291	$ 53,848	$ 45,179
Earnings per share:
Basic (in dollars per share)	$ 2.17	$ 1.90	$ 1.61
Diluted (in dollars per share)	$ 2.13	$ 1.85	$ 1.57
Weighted-average shares outstanding:
Basic (in shares)	27,791,799	28,402,227	28,082,114
Diluted (in shares)	28,270,095	29,079,826	28,771,645