CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 220,602	$ 209,111	$ 446,532	$ 413,422
Costs and expenses:
Cost of goods sold	153,184	145,697	311,145	288,857
Selling, general and administrative	35,256	35,704	72,517	69,970
Design and development	12,981	12,034	26,842	23,755
Operating income	19,181	15,676	36,028	30,840
Interest expense, net	1,170	1,518	2,524	2,928
Equity in earnings of investee	(665)	(555)	(1,186)	(735)
Other expense (income), net	(264)	605	(863)	795
Income before income taxes	18,940	14,108	35,553	27,852
Provision for income taxes	3,820	5,189	7,053	9,760
Net income	15,120	8,919	28,500	18,092
Net loss attributable to noncontrolling interest		(100)		(130)
Net income attributable to Stoneridge, Inc.	$ 15,120	$ 9,019	$ 28,500	$ 18,222
Earnings per share attributable to Stoneridge, Inc.:
Basic (in dollars per share)	$ 0.53	$ 0.32	$ 1.01	$ 0.65
Diluted (in dollars per share)	$ 0.52	$ 0.32	$ 0.99	$ 0.64
Weighted-average shares outstanding:
Basic (in shares)	28,449,303	28,133,432	28,349,362	28,025,805
Diluted (in shares)	28,977,747	28,517,442	28,907,357	28,530,679

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.