Containership owner Seaspan Corp has logged a big jump in fourth quarter earnings as 2016 impairments fell off the balance sheet.

Net profit was $58.55m, against $1.44m in the previous year.

Revenue edged up to $214.38m from $213.19m due to the delivery of newbuildings and interest income from leasing four bareboat charter vessels to MSC.

These increases were partially offset by lower average charter rates for ships that were on short-term charters, it said.