Other Income, Net - Components of Other Income, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Net earnings (loss) of equity method investments	$ 6,082	$ 2,454	$ (180)
Gain on sale of fixed assets and other	1,190	7,331	5,160
Total	$ 7,272	$ 9,785	$ 4,980