CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 225,930	$ 204,311
Costs and expenses:
Cost of goods sold	157,961	143,160
Selling, general and administrative	37,261	34,266
Design and development	13,861	11,721
Operating income	16,847	15,164
Interest expense, net	1,354	1,410
Equity in earnings of investee	(521)	(180)
Other expense (income), net	(599)	190
Income before income taxes	16,613	13,744
Provision for income taxes	3,233	4,571
Net income	13,380	9,173
Net loss attributable to noncontrolling interest		(30)
Net income attributable to Stoneridge, Inc.	$ 13,380	$ 9,203
Earnings per share attributable to Stoneridge, Inc.:
Basic (in dollars per share)	$ 0.47	$ 0.33
Diluted (in dollars per share)	$ 0.46	$ 0.32
Weighted-average shares outstanding:
Basic (in shares)	28,249,420	27,916,652
Diluted (in shares)	28,936,030	28,580,197

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.