The Ameristar Casinos Inc. Board of Directors has declared a cash dividend of 10 1/2 cents per share, payable Sept. 15 to stockholders of record as of Aug. 31.

Ameristar also announced its financial results for the second quarter of 2011, with significant improvement in all key financial performance areas compared to the same period in 2010.

The company’s second quarter report showed its consolidated net revenues had increased by $12.1 million, or 4.1 percent, over the second quarter of 2010 to $305.1 million, and its consolidated adjusted earnings before interest, taxes and amortization (EBITDA) improved by $14.7 million, or 18.4 percent, to $94.2 million for the same period.

Its consolidated adjusted EBITDA margin improved by 3.7 percent over 2010 to 30.9 percent, and its adjusted earnings per share improved by 37 cents over the same period to 50 cents.

Ameristar operates eight casino-hotel properties nationwide, including one in Vicksburg.