CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Mandatory Convertible Preferred Shares Preferred Stock	Mandatory Convertible Preferred Shares	Common Stock	Capital in Excess of Par Value	Accumulated Other Comprehensive Income	Retained Earnings (Accumulated Deficit) Cumulative effect period of adoption adjustment	Retained Earnings (Accumulated Deficit)	Treasury Shares	Non-controlling Interest	Cumulative effect period of adoption adjustment	Total
Balance at the beginning of the period at Dec. 31, 2017			$ 368	$ 2,791,129	$ 11,185		$ 1,423,154	$ (1,314,020)	$ 26,957		$ 2,938,773
Balance (in shares) at Dec. 31, 2017			367,510,000
Increase (Decrease) in Equity
Net income (loss)							(640,948)		28,222		(612,726)
Dividends declared to common shareholders							(82,973)				(82,973)
Dividends declared to preferred shareholders							(12,305)				(12,305)
Common share issuance			$ 40	301,363							301,403
Common share issuance (in shares)			40,250,000
Convertible preferred share issuance	$ 6			277,921							277,927
Convertible preferred share issuance (in shares)	5,750,000
Other comprehensive income (loss), net of tax					(40,510)				(251)		(40,761)
Share-based compensation				26,396							26,396
Noncontrolling interest contributions (distributions)									(5,452)		(5,452)
Accrued distribution on redeemable noncontrolling interest in subsidiary							(11,098)				(11,098)
Other			$ 2	(3,872)							(3,870)
Other (in shares)			1,892,000
Balance at the end of the period at Dec. 31, 2018	$ 6		$ 410	3,392,937	(29,325)		650,842	(1,314,020)	49,476		2,750,326
Balance (in shares) at Dec. 31, 2018	5,750,000		409,652,000
Increase (Decrease) in Equity
Adoption of ASU | Accounting Standards Update 2016-01						$ 9,144				$ 9,144
Adoption of ASU | Accounting Standards Update 2016-16						$ (34,132)				$ (34,132)
Net income (loss)							(702,885)		22,375		(680,510)
Dividends declared to common shareholders							(14,953)				(14,953)
Dividends declared to preferred shareholders							(17,245)				(17,245)
Repurchase of shares		$ (2,900)
Repurchase of shares (in shares)		(136,772)
Other comprehensive income (loss), net of tax					17,537				55		17,592
Share-based compensation				24,659							24,659
Noncontrolling interest contributions (distributions)									(4,552)		(4,552)
Accrued distribution on redeemable noncontrolling interest in subsidiary							(20,534)				(20,534)
Other			$ 6	(4,624)							(4,618)
Other (in shares)	(137,000)		6,546,000
Balance at the end of the period at Dec. 31, 2019	$ 6		$ 416	3,412,972	(11,788)		(104,775)	(1,314,020)	67,354		2,050,165
Balance (in shares) at Dec. 31, 2019	5,613,000		416,198,000
Increase (Decrease) in Equity
Adoption of ASU											(104,775)
Net income (loss)							(805,641)		42,795		(762,846)
Dividends declared to common shareholders							(3,632)				(3,632)
Dividends declared to preferred shareholders							(14,610)				(14,610)
Repurchase of shares	$ (1)	$ (15,000)		(12,127)				$ (1,731)			(13,859)
Repurchase of shares (in shares)	(743,000)	(900,000)						(34,000)
Other comprehensive income (loss), net of tax					664						664
Share-based compensation				24,638							24,638
Noncontrolling interest contributions (distributions)									(5,082)		(5,082)
Accrued distribution on redeemable noncontrolling interest in subsidiary							(17,442)				(17,442)
Other			$ 3	(1,548)					357		(1,188)
Other (in shares)			(407,815,000)
Balance at the end of the period at Dec. 31, 2020	$ 5		$ 419	$ 3,423,935	$ (11,124)		$ (946,100)	$ (1,315,751)	$ 105,424		1,256,808
Balance (in shares) at Dec. 31, 2020	4,870,000		8,383,000
Increase (Decrease) in Equity
Adoption of ASU											$ (946,100)