CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Mandatory Convertible Preferred Shares Preferred Stock	Common Stock	Capital in Excess of Par Value	Accumulated Other Comprehensive Income	Retained Earnings (Accumulated Deficit)	Treasury Shares	Non-controlling Interest	Total
Balance at the beginning 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	416,198
Increase (Decrease) in Equity
Net income (loss)					(391,827)		17,465	(374,362)
Dividends declared to common shareholders					(3,514)			(3,514)
Dividends declared to preferred shareholders					(3,652)			(3,652)
Repurchase of shares	$ (1)		(12,126)			(1,731)		(13,858)
Repurchase of shares (in shares)	(724)
Other comprehensive income (loss), net of tax				(17,218)				(17,218)
Share-based compensation			9,158					9,158
Accrued distribution on redeemable noncontrolling interest in subsidiary					(4,432)			(4,432)
Other		$ 3	(1,550)				358	(1,189)
Other (in shares)		3,268
Balance at the end of the period at Mar. 31, 2020	$ 5	$ 419	3,408,454	(29,006)	(508,200)	(1,315,751)	85,177	1,641,098
Balance (in shares) at Mar. 31, 2020	4,889	419,466
Increase (Decrease) in Equity
Adoption of ASU								(946,100)
Balance at the beginning 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	8,383
Increase (Decrease) in Equity
Net income (loss)					(137,086)		8,776	(128,310)
Deferred dividends for earned PSUs					(10)			(10)
Dividends declared to preferred shareholders					(3,653)			(3,653)
Other comprehensive income (loss), net of tax				368				368
Share-based compensation			6,775					6,775
Accrued distribution on redeemable noncontrolling interest in subsidiary					(2,402)			(2,402)
Other		$ (2)	(1,621)				1	(1,622)
Other (in shares)		120
Balance at the end of the period at Mar. 31, 2021	$ 5	$ 417	$ 3,429,089	$ (10,756)	$ (1,089,251)	$ (1,315,751)	$ 114,201	1,127,954
Balance (in shares) at Mar. 31, 2021	4,870	8,503
Increase (Decrease) in Equity
Adoption of ASU								$ (1,089,251)