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Non-operating income, net | 12 Months Ended
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Dec. 31, 2017
Non-operating (loss) income, net [Abstract] |
Non-operating Income, Net | Non-operating Income (Loss), Net The following table presents the components of Non-operating income (loss), net:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Interest income | $ | 17,944 |  |  | $ | 6,191 |  |  | $ | 2,128 |
Gain on sale of business | 10,421 |  |  | — |  |  | — |
Unrealized (loss) gain on contingent interest derivative on Subordinated Convertible Debentures | (893 | ) |  | 2,402 |  |  | (14,130 | )
Other, net | 154 |  |  | 1,572 |  |  | 1,337 |
Total non-operating income (loss), net | $ | 27,626 |  |  | $ | 10,165 |  |  | $ | (10,665 | )
Interest income is earned principally from the Company’s surplus cash balances and marketable securities. On April 1, 2017, the Company completed the sale of its iDefense business, which resulted in a gain of approximately $10.4 million in 2017. The unrealized gains and losses on the contingent interest derivative on the Subordinated Convertible Debentures reflects the change in value of the derivative that results primarily from the changes in the Company’s stock price. The fair value of the contingent interest derivative for periods after August 15, 2017 is negligible due to the Company’s right to redeem the debentures. Contingent interest after August 15, 2017 was included in Interest expense.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3,6,7,9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Non-operating (loss) income, net [Abstract] + References No definition available. + Details
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