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Non-operating income, net
 12 Months Ended
Dec. 31, 2021
Non-operating (loss) income, net [Abstract]  
Non-operating Income, Net Non-operating (Loss) Income, Net
The following table presents the components of Non-operating income, net:
Year Ended December 31,
202120202019
(In thousands)
Loss on extinguishment of debt$(2,149)$— $— 
Interest income582 7,815 26,596 
Gain on sale of business— 6,402 817 
Transition services income— 2,100 15,600 
Other, net238 (130)247 
Total non-operating (loss) income, net$(1,329)$16,187 $43,260 
The redemption of the 2023 Notes resulted in a loss on debt extinguishment of $2.1 million related to the unamortized debt issuance costs on the notes. Interest income is earned principally from the Company’s surplus cash balances and marketable securities. The lower interest income in 2021 and 2020 reflects a decline in interest rates on our investments in debt securities. Gain on sale of business and transition services income in 2020 and 2019 relate to the sale of our security services customer contracts.