Investment in Other Affiliates Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments in and Advances to Affiliates [Line Items]
Income (loss) from equity method investments	$ 0	$ (500)	$ 0	$ (1,100)

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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