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OTHER INCOME (EXPENSE) (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Income and Expenses [Abstract] |
Interest and Other Income [Table Text Block] | Other income (expense) consisted of the following for the years set forth below (amounts in thousands):
| 2017 |  | 2016 |  | 2015
Equity investment income | $ | 3,615 |  |  | $ | 2,977 |  |  | $ | 1,790 |
Interest income | 3,363 |  |  | 3,206 |  |  | 2,667 |
Investment gain (loss) related to investments for deferred compensation | 2,725 |  |  | 190 |  |  | (361 | )
Building rental income | 2,372 |  |  | 2,109 |  |  | 936 |
Discount amortization on prepaid royalty | 866 |  |  | 1,491 |  |  | 1,956 |
Gain (loss) on sale of assets | (701 | ) |  | 2,229 |  |  | 2,418 |
Other income (expense) | (1,099 | ) |  | 264 |  |  | 1,657 |
| $ | 11,141 |  |  | $ | 12,466 |  |  | $ | 11,063 |

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