NCO Group ( NCOG) surged more than 40% Tuesday after the company's CEO offered to acquire all of the outstanding shares of the Horsham, Pa.-based outsourcing services company for $27.50 in cash each.

The executive, Michael J. Barrist, intends to partner in with One Equity Partners II and to finance the deal through a combination of $388 million of equity and about $815 million of debt.

The company's board is scheduled to meet later Tuesday to form a special committee of independent directors to consider the proposal. The special committee will retain independent financial advisors and legal counsel, the company said. Shares were up $7.26 to $26.31 in recent trading.

Camtek ( CAMT) gained after the Israel-based automatic optical inspection systems company said first-quarter revenue increased 172% to $24.9 million. The company posted income of $4.4 million, or 16 cents a share, up from a loss of $2.4 million, or 9 cents a share, a year ago. Shares were up 83 cents, or 12.8%, to $7.33 in recent trading.

IDT ( IDT) surged on news that Liberty Media ( LINTA) planned to buy IDT Entertainment from the Newark, N.J.-based telecommunications and entertainment company for $186 million in cash.

Under the deal, which is expected to close within the next three months, Liberty Media will pay IDT $186 million in cash and all of Liberty Media's equity interests in IDT and its subsidiaries, including about 17.2 million shares of IDT's Class B common stock and Liberty Media's roughly 5% interest in IDT Telecom. Liberty will also assume IDT Entertainment's existing debt.

On closing, IDT Entertainment and Liberty's Starz Entertainment Group will enter into a five-year programming output agreement for the broadcast of certain IDT programming on Starz's premium channels. Shares of IDT gained $1.81, or 16.2%, to $12.96 in recent trading. Liberty Media climbed 15 cents, or 0.8%, to $18.30.

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