Proper way to address Casualty Gain on Rental Property

Going crazy trying to reconcile Casualty Loss/Gain for rental property, at a minimum to defer having to pay on a gain. Have Owned the rental property for 14 years, Adjusted basis is around 70K while Fair Market Value closer to 190K. Insurance paid 160K for repairs. When I report the casualty, I find I have approx 90K in GAIN. Seems there should be a mechanism that allows me to adjust the basis only to reflect new values, yet defer paying tax on the gain until such a time as I sell the property as that would be the only time I see the gain. Insurance covered close to 100% of repairs, all work is complete, house re-rented in December, but insurance paperwork is still finalizing. All numbers are representative of the problem for illustrative purposes, but the problem is real. BTW, IRS Pub 547 does not provide much help except to say you may have to pay.