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OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Income and Expenses [Abstract] |  |  |
Equity investment income | $ 3,993 | $ 3,615 | $ 2,977
Interest income | 2,107 | 3,363 | 3,206
Rental Income, Nonoperating | 1,804 | 2,372 | 2,109
Investment gain (loss) related to investments for deferred compensation | 687 | 2,725 | 190
Other income (expense) | 10,607 | (2,967) | 1,433
Other income | $ 19,198 | $ 9,108 | $ 9,915

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