Net income was US$184.5mln, or US$2.49 per share. Earnings, adjusted for one-time gains and costs, came in at 77 US cents a share.
The results exceeded expectations, where consensus was for earnings of 65 US cents per share.
Elsewhere, United Therapeutics Corp shares were at US$134.96 as it beat Wall Street expectations, reporting fourth-quarter earnings of US$19mln.
The firm is projected to post quarterly loss at $0.08 per share on revenues of $376.33mln.
DISH Network Corp (NASDAQ:DISH) lost 2.45% in pre-market deals as it reported a fourth-quarter profit surge due to a US$1.2bn benefit related to US tax law reforms, the US satellite and internet TV provider said.