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Investments - Other Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Investment [Line Items] |  |
Total investments carried at fair value | $ 1,779 | $ 3,279
Total investments carried at cost | 8,487 | 7,629
Total equity method investments | 522 | 564
Total investments | 10,788 | 11,472
CoBank |  |
Investment [Line Items] |  |
Total investments carried at cost | 7,705 | 6,818
Other equity method investments |  |
Investment [Line Items] |  |
Total investments carried at cost | 782 | 811
Total equity method investments | 522 | 564
Domestic equity funds |  |
Investment [Line Items] |  |
Total investments carried at fair value | 1,409 | 2,856
International equity funds |  |
Investment [Line Items] |  |
Total investments carried at fair value | $ 370 | $ 423

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