CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 203,582	$ 173,846	$ 617,004	$ 523,365
Costs and expenses:
Cost of goods sold	141,033	124,098	429,890	375,705
Selling, general and administrative	37,277	27,817	107,247	82,836
Design and development	11,976	10,151	35,731	30,912
Operating income	13,296	11,780	44,136	33,912
Interest expense, net	1,508	1,684	4,436	5,038
Equity in earnings of investee	(465)	(307)	(1,200)	(603)
Other expense (income), net	395	(497)	1,190	(722)
Income before income taxes	11,858	10,900	39,710	30,199
Provision for income taxes	3,809	919	13,569	3,114
Net income	8,049	9,981	26,141	27,085
Net loss attributable to noncontrolling interest		(303)	(130)	(2,009)
Net income attributable to Stoneridge, Inc.	$ 8,049	$ 10,284	$ 26,271	$ 29,094
Earnings per share attributable to Stoneridge, Inc.:
Basic (in dollars per share)	$ 0.29	$ 0.37	$ 0.94	$ 1.05
Diluted (in dollars per share)	$ 0.28	$ 0.36	$ 0.92	$ 1.03
Weighted-average shares outstanding:
Basic (in shares)	28,135,705	27,792,469	28,062,438	27,753,015
Diluted (in shares)	28,652,342	28,359,277	28,612,626	28,266,089

Interest expense incurred and charged against earnings during the reporting period on all debt, including interest on short-term obligations and long-term debt, and amortization of debt issuance costs and debt discounts. Interest expense is net of interest income earned during the reporting period.

No definition available.