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Investments - Other Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Investment [Line Items] |  |
Total investments carried at fair value | $ 2,037 | $ 1,779
Total investments carried at cost | 8,704 | 8,487
Total equity method investments | 533 | 522
Total investments | 11,274 | 10,788
CoBank |  |
Investment [Line Items] |  |
Total investments carried at cost | 7,925 | 7,705
Other |  |
Investment [Line Items] |  |
Total investments carried at cost | 779 | 782
Total equity method investments | 533 | 522
Domestic equity funds |  |
Investment [Line Items] |  |
Total investments carried at fair value | 1,628 | 1,409
International equity funds |  |
Investment [Line Items] |  |
Total investments carried at fair value | $ 409 | $ 370

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