Last Monday's middling earnings release for Ameristar Casinos' (NASDAQ:ASCA) third quarter seems to have been resoundingly trumped by the recent announcement that the company might be up for sale.

Ameristar declined to comment on a possible sale Monday, but I think its actions speak volumes. Last week, the company filed a report with the SEC detailing a new "change in control severance plan," providing compensation and benefits to senior-level employees in case of termination, should a sale take place.

In other words, while the company continues to develop its properties, management is certainly bracing for a sale. And as we noted a couple of weeks ago, several key players -- including MGM Mirage (NYSE:MGM), Las Vegas Sands (NYSE:LVS), Boyd Gaming (NYSE:BYD), and rival Pinnacle Entertainment (NYSE:PNK) -- may have strategic interest in Amerstar's well-positioned properties in its key regional markets. Meanwhile, the quarterly earnings report itself was a collection of ups and downs.

On the down side...
Ameristar Council Bluffs was a disappointment, posting a 3.4% decline in revenue and a 5.2% drop in EBITDA, reflecting "softer than expected market growth." The company also noted that year-to-date performance of the Resort East Chicago property acquired in September has been "significantly less than previously anticipated," with full-year adjusted EBITDA now expected to be $54 million to $55 million. In addition, that property has been hit with an additional $1.5 million to $2 million per quarter in property tax expense, as a result of a significant increase in the assessed value of the property. The company intends to contest that assessment.

On the bright side...
Ameristar Kansas City posted a 12.3% increase in EBITDA, on a slight gain in net revenue, reflecting increased efficiencies. Ameristar Black Hawk reported an 11% increase in EBITDA, on an 8% climb in net revenue.

Ameristar St. Charles (St. Louis) held up well, maintaining basically flat results despite construction disruption from the property's new hotel, road work, and a mass overhaul of the gaming floor. It also seems to have weathered the expansion of the Casino Queen, about a half-hour drive away in East St. Louis.

However, the company did say that its full opening of St. Charles' new 400-room all-suite hotel may be delayed into next quarter, though Ameristar still hopes to have 200 rooms available for December. In the meantime, Pinnacle Entertainment's $507 million Lumiere Place casino opens in downtown St. Louis on Dec. 19.

On a final positive note, the company also doubled down on its share repurchases, buying back 376,000 shares at an average price of $25.65 apiece, for a total of $9.7 million.

Though the Q3 results weren't terribly impressive and the company does face some near-term challenges, Ameristar remains well positioned and the prospects for a sale should continue to buoy the stock price.

Place your bets on further Foolishness:

Ameristar is a Hidden Gems recommendation. Discover Tom Gardner and Bill Mann's full list of stellar small-cap stock selections with a free 30-day trial.

Fool contributor Jeff Hwang owns shares of Ameristar Casinos and Pinnacle Entertainment. The Motley Fool's disclosure policy is just waiting for the flop.