Assets and Liabilities Measured at Fair Value (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value

	June 30, 2020				December 31, 2019
			Quoted			Quoted
			prices			prices
			in active	Significant		in active	Significant
			markets	other		markets	other
			for identical	observable		for identical	observable
			assets	inputs		assets	inputs
Description	Total		(Level 1)	(Level 2)	Total	(Level 1)	(Level 2)
	amounts in thousands
Cash equivalents	$	23,588	23,588	—	54,552	54,552	—
Equity securities	$	2,732,999	2,732,999	—	2,600,008	2,600,008	—
Investment in Liberty Broadband	$	5,290,841	5,290,841	—	5,367,242	5,367,242	—
Derivative instrument liability	$	61,437	—	61,437	71,305	—	71,305

Schedule of Realized and Unrealized Gains (Losses) on Financial Instruments

	Three months ended			Six months ended
	June 30,			June 30,
	2020		2019	2020		2019
	amounts in thousands
Equity securities	$	395,075	258,718		133,941	593,038
Investment in Liberty Broadband		565,107	532,669		(76,401)	1,373,928
Derivative instruments		(37,272)	(47,217)		9,868	(118,361)
	$	922,910	744,170		67,408	1,848,605