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Non-operating income, net | 12 Months Ended
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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,
| 2020 |  | 2019 |  | 2018
| (In thousands)
Interest income | $ | 7,815 |  |  | $ | 26,596 |  |  | $ | 26,490 |
Gain on sale of business | 6,402 |  |  | 817 |  |  | 54,840 |
Transition services income | 2,100 |  |  | 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.

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- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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- Definition Non-operating (loss) income, net [Abstract] + References No definition available. + Details
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