BOISE, Idaho (AP) — Federal investigators say a Boise-based restaurant chain must pay $230,000 in unpaid overtime and damages to more than 50 workers.

The U.S. Department of Labor announced Monday that Chapala Mexican Restaurant violated overtime laws at its Boise, Nampa, Garden City and McCall locations. Authorities tell the Idaho Statesman that the restaurant owners also failed to pay cooks and tip employees for all hours worked.

Federal law states that non-exempt employees are to be paid at least federal minimum wages of $7.25 per hour, plus time and a half their regular wage for every hour worked beyond 40 hours per week. The law requires employers who break the law to compensate employees for their back wages and an equal amount in liquidated damages.