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Non-operating income, net | 12 Months Ended
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Dec. 31, 2019
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,
| 2019 |  | 2018 |  | 2017
| (In thousands)
Interest income | $ | 26,596 |  |  | $ | 26,490 |  |  | $ | 17,944 |
Transition services income | 15,600 |  |  | 1,132 |  |  | — |
Gain on sale of business | 817 |  |  | 54,840 |  |  | 10,421 |
Loss on extinguishment of subordinated convertible debentures | — |  |  | (6,554 | ) |  | — |
Other, net | 247 |  |  | 1,061 |  |  | (739 | )
Total non-operating income, net | $ | 43,260 |  |  | $ | 76,969 |  |  | $ | 27,626 |
Interest income is earned principally from the Company’s surplus cash balances and marketable securities. Transition services income and gain on sale of business in 2019 and 2018 relate to the divested security services business. Gain on sale of business in 2017 relates to the divested iDefense business.

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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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