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Investments - Other Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investment [Line Items]
Total investments carried at fair value	$ 2,107	$ 1,779
Total investments carried at cost	8,924	8,487
Total equity method investments	532	522
Total investments	11,563	10,788
CoBank
Investment [Line Items]
Total investments carried at cost	8,147	7,705
Other
Investment [Line Items]
Total investments carried at cost	777	782
Total equity method investments	532	522
Domestic equity funds
Investment [Line Items]
Total investments carried at fair value	1,690	1,409
International equity funds
Investment [Line Items]
Total investments carried at fair value	$ 417	$ 370

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