What happened 

Shares of tire manufacturer Cooper Tire & Rubber Co (NYSE:CTB) fell as much as 11.3% in trading Thursday after reporting earnings for the first quarter of 2017. Shares were still down 9.9% at 2:40 p.m. EDT and showed no signs of recovery. 

So what

Unit volume increased 2.9% versus a year ago, but net sales fell 1% to $643 million and net income dropped almost in half to $30.6 million, or $0.57 per share. Analysts were expecting $687.9 million in revenue and $0.74 per share in earnings. 

Tires lined up outside at sunset.

Image source: Getty Images.

Management pointed to a competitive pricing environment and a $50 million increase in raw material costs as the reason results were down in the quarter. These hit Cooper Tire & Rubber especially hard because it uses a last in-first out accounting method in the U.S., meaning it used high cost materials while low cost materials sit on the balance sheet. 

Now what

Most of the pressures facing Cooper today are out of its control, but that's not much consolation for investors. Management is also adjusting by raising prices, which it hopes will stem some of the pressure on the bottom line. On the bright side, international volume was strong and if that continues it should offset some of the pressure in the U.S. Long-term, Cooper is still a leading tire supplier with a profitable business long-term, so today's dip in earnings and shares is a great buying opportunity for investors. 

Travis Hoium has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.