General - Going Concern (Details) - USD ($) $ in Thousands					3 Months Ended		12 Months Ended
	Mar. 27, 2020	Mar. 23, 2020	Mar. 16, 2020	Jan. 10, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Jun. 26, 2020	May 18, 2020
Net loss					$ 12,670	$ 32,172	$ 509,100	$ 169,800
Impairment of goodwill and other intangible assets							349,600	48,100
Net cash used in operating activities					(35,373)	$ (42,648)	(63,900)	23,600
Working Capital Deficit					16,900		147,100	123,500
Interest Paid on Long Term Debt							144,500
Accrued liability					57,400
Minimum Liquidity under credit agreement				$ 40,000	60,000		40,000	$ 35,000
Accumulated deficit					1,224,178		1,211,508
Cash and cash equivalents					113,013		$ 6,198
Amount of facility				$ 160,000
Facility term (years)				5 years
Membership interests			$ 40,000
Adjustment of purchase consideration			2,000
Cash Saving In Temporary Freeze Of Employee Related Cost		$ 23,400
Cash Saving Due To Refund Of Tax Relating To Aid Relief	$ 29,000
Subsequent Events
Minimum Liquidity under credit agreement										$ 35,000
Cash and cash equivalents									$ 89,000
Borrowing facility									$ 13,000
SourceHOV
Gain on sale of investments					35,300
Membership interests			$ 40,000
Adjustment of purchase consideration					$ 2,000