LOS ANGELES – Comcast said Tuesday that it’s buying General Electric’s 49 percent stake in the NBCUniversal joint venture for $16.7 billion several years early, as the company takes advantage of low borrowing costs and what CEO Brian Roberts called a “very attractive price.”

The company is also buying from GE such assets as NBC’s headquarters at 30 Rockefeller Plaza in New York and CNBC’s headquarters in Englewood Cliffs, N.J., for about $1.4 billion.

At the same time, the company said it would raise its annual dividend 20 percent to 78 cents per share and buy back $2 billion in shares this year.

Comcast shares jumped $2.93, or 7.5 percent, to $41.90 in after-hours trading. GE shares rose 76 cents, or 3.4 percent, to $23.34.

Comcast Corp. had bought a majority stake in the television and movie company in 2011. It had planned to take a larger stake in it over seven years, paying for it from operating cash, starting in July 2014.

But Roberts told The Associated Press that the sale of its stake in pay TV network A&E and some wireless spectrum gave it plenty of cash on hand. He also says Comcast got a good deal given that the stock price of media conglomerates has been rising.

“We thought that we would have to pay more later,” he said.

In a statement, Roberts added that “our decision to acquire GE’s ownership is driven by our sense of optimism for the future prospects of NBCUniversal and our desire to capture future value that we hope to create for our shareholders.”

The new deal is expected to close by the end of March.

Comcast had bought a 51 percent stake in NBC Universal, home of the NBC television network, from General Electric Co. for $13.8 billion in cash and assets. It came after the government approved Comcast’s takeover of NBCUniversal with conditions intended to prevent it from keeping NBC programming to itself at the detriment of other cable operators and video websites.

Comcast, which is based in Philadelphia, is the nation’s largest cable TV operator with 22 million subscribers. Besides the television network, NBCUniversal runs such cable channels as CNBC, MSNBC and Bravo, the Universal Pictures movie studio and theme parks.

Comcast paid General Electric just under $6.2 billion in cash and contributed its pay TV channels such as E! Entertainment Television and The Golf Channel, worth $7.25 billion, to NBC Universal.

GE’s stake in NBC Universal fell to 49 percent from 80 percent, but GE had planned to diminish that to zero by being paid out from the venture over about seven years. Before the Comcast deal closed, GE bought out the 20 percent stake held by France’s Vivendi SA for $5.8 billion in order to complete the deal.