CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Total net sales	$ 208,853	$ 203,582	$ 655,385	$ 617,004
Costs and expenses:
Cost of goods sold	145,568	141,033	456,713	429,890
Selling, general and administrative	32,589	37,277	105,106	107,247
Design and development	12,384	11,976	39,226	35,731
Operating income	18,312	13,296	54,340	44,136
Interest expense, net	1,155	1,508	3,679	4,436
Equity in earnings of investee	(249)	(465)	(1,435)	(1,200)
Other expense (income), net	647	395	(216)	1,190
Income before income taxes	16,759	11,858	52,312	39,710
Provision for income taxes	3,467	3,809	10,520	13,569
Net income	13,292	8,049	41,792	26,141
Net loss attributable to noncontrolling interest				(130)
Net income attributable to Stoneridge, Inc.	$ 13,292	$ 8,049	$ 41,792	$ 26,271
Earnings per share attributable to Stoneridge, Inc.:
Basic (in dollars per share)	$ 0.47	$ 0.29	$ 1.47	$ 0.94
Diluted (in dollars per share)	$ 0.46	$ 0.28	$ 1.44	$ 0.92
Weighted-average shares outstanding:
Basic (in shares)	28,452,807	28,135,705	28,383,843	28,062,438
Diluted (in shares)	29,065,046	28,652,342	29,073,100	28,612,626

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.