Medical staffing company AMN Healthcare reported 2017 fourth quarter revenue of $509 million, a 4 percent year-over-year increase.

In addition, compared to 2016, revenue for the full year in 2017 was up 5 percent to $1.98 billion. That’s according to company results released Feb. 15.

"We hit new highs in revenue and earnings and delivered a total shareholder return of 28 percent," said Susan Salka, president and CEO of AMN Healthcare.

In the fourth quarter, AMN’s travel nurse division, the largest chunk of its business, was up 8 percent. The San Diego company forecasts the division will grow 8 to 9 percent in 2018.

The travel nursing industry has expanded in recent years due to challenges finding full-time staff in certain parts of the country, an aging population and a revitalized economy.

Gross margin for 2017 was 32.4 percent, versus 32.6 percent for the prior year. AMN attributed the decline to “lower bill to pay spreads” and “an unfavorable change in business mix in our other workforce solutions segment.”