Long-term debt consisted of the following:

On April 19, 2018, we took delivery of Norwegian Bliss. To finance the payment due upon delivery, we had export financing in place for 80% of the contract price. The associated $850.0 million term loan bears interest at a fixed rate of 3.92% with a maturity date of April 19, 2030. Principal and interest payments are payable semiannually.

On April 4, 2018, we redeemed $135.0 million principal amount of the $700.0 million aggregate principal amount of outstanding 4.75% Senior Notes due 2021 (the “Notes”) at a price equal to 100% of the principal amount of the Notes being redeemed and paid the premium of $5.1 million and accrued interest of $1.9 million. The redemption also resulted in a write off of $1.2 million of certain fees. Following the partial redemption, $565.0 million aggregate principal amount of Notes remained outstanding.

Interest expense, net for the year ended December 31, 2018 was $270.4 million which included $31.4 million of amortization of deferred financing fees and a $6.3 million loss on extinguishment of debt. Interest expense, net for the year ended December 31, 2017 was $267.8 million which included $32.5 million of amortization of deferred financing fees and a $23.9 million loss on extinguishment of debt. Interest expense, net for the year ended December 31, 2016 was $276.9 million which included $34.7 million of amortization of deferred financing fees and a $27.7 million loss on extinguishment of debt.

Certain of our debt agreements contain covenants that, among other things, require us to maintain a minimum level of liquidity, as well as limit our net funded debt-to-capital ratio, and maintain certain other ratios and restrict our ability to pay dividends. Substantially all of our ships and other property and equipment are pledged as collateral for certain of our debt. We believe we were in compliance with our covenants as of December 31, 2018.

The following are scheduled principal repayments on long-term debt including capital lease obligations as of December 31, 2018 for each of the next five years (in thousands):

We had an accrued interest liability of $37.2 million and $31.9 million as of December 31, 2018 and 2017, respectively.