Earnings (Losses) Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended								12 Months Ended
	Apr. 22, 2020	Apr. 20, 2020	Dec. 31, 2020 USD ($) $ / shares	Sep. 30, 2020 USD ($) $ / shares	Jun. 30, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Jan. 31, 2017
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax			$ (103,934)	$ (146,682)	$ (137,968)	$ (374,269)	$ (284,533)	$ (99,788)	$ (192,801)	$ (103,376)	$ (762,853)	$ (680,498)	$ (598,063)
Less: net (income) loss attributable to noncontrolling interest			(4,358)	(10,805)	(10,167)	(17,465)	21,827	(19,297)	(10,729)	(14,176)	(42,795)	(22,375)	(28,222)
Less: preferred stock dividends			(3,653)	(3,653)	(3,653)	(3,652)	(4,309)	(4,310)	(4,312)	(4,313)	(14,611)	(17,244)	(12,305)
Less: accrued distribution on redeemable noncontrolling interest in subsidiary											(17,442)	(20,534)	(11,098)
Less: distributed and undistributed earnings allocated to unvested shareholders											(125)	(459)	(1,819)
Adjusted income (loss) from continuing operations, net of tax - basic											(837,826)	(741,110)	(651,507)
Income (loss) from discontinued operations, net of tax			$ 55	$ 22	$ 23	$ (93)	$ 22	$ 157	$ (34)	$ (157)	$ 7	$ (12)	$ (14,663)
Weighted-average number of shares outstanding - basic | shares											7,059	7,032	6,688
Earnings (losses) Per Share:
Basic from continuing operations (in dollars per share) | $ / shares			$ (16.46)	$ (23.42)	$ (22.13)	$ (56.72)	$ (38.66)	$ (18.27)	$ (30.31)	$ (18.11)	$ (118.69)	$ (105.39)	$ (97.42)
Basic from discontinued operations (in dollars per share) | $ / shares			0.01			(0.01)		0.02		(0.02)			(2.19)
Total Basic (in dollars per share) | $ / shares			$ (16.45)	$ (23.42)	$ (22.13)	$ (56.73)	$ (38.66)	$ (18.25)	$ (30.31)	$ (18.13)	$ (118.69)	$ (105.39)	$ (99.61)
DILUTED EPS:
Adjusted income (loss) from continuing operations, net of tax - basic											$ (837,826)	$ (741,110)	$ (651,507)
Adjusted income (loss) from continuing operations, net of tax - diluted											(837,826)	(741,110)	(651,507)
Income (loss) from discontinued operations, net of tax			$ 55	$ 22	$ 23	$ (93)	$ 22	$ 157	$ (34)	$ (157)	$ 7	$ (12)	$ (14,663)
Weighted-average number of shares outstanding - basic | shares											7,059	7,032	6,688
Weighted-average number of shares outstanding - diluted | shares											7,059	7,032	6,688
Earnings (losses) per share:
Diluted from continuing operations (in dollars per share) | $ / shares			$ (16.46)	$ (23.42)	$ (22.13)	$ (56.72)	$ (38.66)	$ (18.27)	$ (30.31)	$ (18.11)	$ (118.69)	$ (105.39)	$ (97.42)
Diluted from discontinued operations (in dollars per share) | $ / shares			0.01			(0.01)		0.02		(0.02)			(2.19)
Total Diluted (in dollars per share) | $ / shares			$ (16.45)	$ (23.42)	$ (22.13)	$ (56.73)	$ (38.66)	$ (18.25)	$ (30.31)	$ (18.13)	$ (118.69)	$ (105.39)	$ (99.61)
Reverse stock split ratio	50	0.02
0.75% senior exchangeable notes due January 2024
Earnings (losses) per share:
Interest rate on senior notes due (as a percent)			0.75%								0.75%			0.75%
0.75% senior exchangeable notes due January 2024 | Minimum
Earnings (losses) per share:
Share issued price (in dollars per share) | $ / shares			$ 1,257.81								$ 1,257.81