Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Other Income Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income (Expense)
Marketable investment securities - realized and unrealized gains (losses)	$ 178	$ 4,604	$ 8,165
Derivative instruments - net realized and/or unrealized gains (losses)	(22,000)
Costs related to early redemption of debt		(483)	(3,261)
Gain (loss) on sale of subsidiary			7,004
Equity in earnings (losses) of affiliates	410	(3,714)	(2,110)
Other	1,248	11,117	2,003
Total	$ (20,164)	$ 11,524	$ 11,801