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Non-operating income, net
 12 Months Ended
Dec. 31, 2020
Non-operating (loss) income, net [Abstract]  
Non-operating Income, Net Non-operating Income, Net
The following table presents the components of Non-operating income, net:
Year Ended December 31,
202020192018
(In thousands)
Interest income$7,815 $26,596 $26,490 
Gain on sale of business6,402 817 54,840 
Transition services income2,100 15,600 1,132 
Loss on extinguishment of subordinated convertible debentures— — (6,554)
Other, net(130)247 1,061 
Total non-operating income, net$16,187 $43,260 $76,969 
Interest income is earned principally from the Company’s surplus cash balances and marketable securities. The lower interest income in 2020 reflects a decline in interest rates on our investments in debt securities. Transition services income and gain on sale of business relate to the sale of our security services customer contracts. The transition services agreement ended in February 2020. The gain on sale of business in 2020 primarily represents the excess of the contingent consideration received related to the sale of our security services customer contracts compared to the estimated receivable.