Debt (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Schedule of Debt

	Outstanding
	principal		Carrying value
	June 30,		June 30,		December 31,
	2020		2020		2019
	amounts in thousands
Margin Loan Facility	$	1,300,000		1,300,000	1,300,000
Exchangeable senior debentures		477,250		660,963	658,839
Senior notes		775,000		794,408	796,138
Senior credit facility		511,436		511,436	512,666
Wells Fargo note payable		6,773		6,773	7,066
Deferred financing costs		—		(7,197)	(8,491)
Total debt	$	3,070,459		3,266,383	3,266,218
Debt classified as current				(664,087)	(3,008)
Total long-term debt			$	2,602,296	3,263,210