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Investment And Other Gains Investment And Other Gains (Tables) | 12 Months Ended
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Dec. 31, 2017
Investment And Other Gains [Abstract] |
Schedule of Investment And Other Gains [Table Text Block] | The following table summarizes our investment and other gains (in thousands):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Gains on sales of marketable securities | 10,038 |  |  | 29,673 |  |  | 23,529 |
Gain on sale of real estate | 50 |  |  | 4,582 |  |  | 1,126 |
Other gains | — |  |  | 1,657 |  |  | — |
| $ | 10,088 |  |  | $ | 35,912 |  |  | $ | 24,655 |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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