QUARTERLY FINANCIAL DATA (UNAUDITED) - Summarized Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Mar. 31, 2020	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 60,143	$ 153,783	$ 208,765	$ 247,038	$ 248,190	$ 258,343	$ 274,671	$ 287,835			$ 669,729		$ 1,069,039		$ 1,235,479
Cost of service and product revenues, excluding depreciation and amortization	19,056	76,496	94,616	116,809	133,885	142,799	151,281	153,678			306,977		581,643
Operating income (loss)	(68,567)	(59,399)	(7,466)	(9,906)	(1,835)	(22,162)	(1,551)	3,429		$ (76,771)	(145,338)		(22,119)		(5,139)
(Loss) income from continuing operations	(73,654)	(67,842)	(16,520)	(14,178)	(5,265)	(14,811)	417	(463)			(172,194)		(20,122)		59,621
(Loss) income from discontinued operations	79	301	79	373	(131)	178	6,113	(264)			832		5,896		(53,185)
Net (loss) income	$ (73,575)	$ (67,541)	$ (16,441)	$ (13,805)	$ (5,396)	$ (14,633)	$ 6,530	$ (727)	$ (30,246)	(97,787)	$ (171,362)		$ (14,226)		$ 6,436
(Loss) Income from continuing operations (in dollars per share)	$ (2.05)	$ (1.89)	$ (0.46)	$ (0.39)	$ (0.14)	$ (0.37)	$ 0.01	$ (0.01)			$ (4.79)		$ (0.48)		$ 1.28
Income (loss) from discontinued operations (in dollars per share)	0	0.01	0	0.01	0	0	0.14	(0.01)			0.02		0.14		(1.14)
Net (loss) income per share, basic (in dollars per share)	(2.05)	(1.88)	(0.46)	(0.38)	(0.14)	(0.36)	0.15	(0.02)			(4.77)	[1]	(0.34)	[1]	0.14	[1]
(Loss) income from continuing operations, per share, diluted (in dollars per share)	(2.05)	(1.89)	(0.46)	(0.39)	(0.14)	(0.37)	0.01	(0.01)			(4.79)		(0.48)		1.27
(Loss) income from discontinued operations (in dollars per share)	0	0.01	0	0.01	0	0	0.14	(0.01)			0.02		0.14		(1.13)
Net (loss) income per share, diluted (in dollars per share)	$ (2.05)	$ (1.88)	$ (0.46)	$ (0.38)	$ (0.14)	$ (0.36)	$ 0.15	$ (0.02)			$ (4.77)	[1]	$ (0.34)	[1]	$ 0.14	[1]
Goodwill impairment		$ 40,164								$ 40,164	$ 40,164		$ 0		$ 0
Long-lived asset impairment											22,560		0		0
TBG mall restructuring						$ 20,700					$ 2,333		$ 21,816		$ 0

[1] Total is a recalculation; line items calculated individually may not sum to total due to rounding.