NEW YORK (Bloomberg) Bermuda-based Teekay Corp, owner of vessels that haul oil and liquefied natural gas, reported fourth-quarter profit more than doubled because of gains from interest-rate swaps.Net income increased to $85.9 million, or $1.16 a share, from $29.8 million, or 40 cents, a year earlier, the company said in a statement. Revenue slid 4.9 percent to $497.3 million.Excluding interest-rate swaps and other items, Teekay reported an adjusted loss of $37.8 million, or 51 cents, versus a loss of $33.3 million, or 45 cents a share, a year earlier. On that basis, the loss estimated by 10 analysts surveyed by Bloomberg was 40 cents a share.Teekay diversified its revenue sources by entering into liquefied-natural-gas transportation and the offshore shuttle-tanker market. Revenue from both sectors increased during the quarter.“We expect the incremental capex to keep going towards the offshore business segment, where they are probably seeing the best return,” said Michael Webber, senior analyst at Wells Fargo Securities LLC in New York, who has an “outperform” rating on the stock. “They have a more diversified platform.”Teekay gained two cents, or 0.1 percent, to $35.19 yesterday in New York Stock Exchange composite trading. The shares are up 6.4 percent this year. Results were released before the start of regular US trading.Shipping revenue from the offshore shuttle-tanker segment rose to $203.1 million from $190.9 million. Revenue from LNG tankers rose to $96.8 million from $95.3 million.Teekay’s Aframax vessels earned $12,659 a day in spot rates during the quarter, down from $13,963 a year earlier. Suezmaxes earned an average rate of $15,564 a day, down from $21,109.Teekay operates 137 vessels, 36 of them Aframax, according to the company’s website. Aframaxes can move about 600,000 barrels of oil. Suezmaxes can carry about one million barrels.