Note 16 - Earnings Per Share - Reconciliation of Earnings (Loss) and the Weighted Average Number of Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income/(loss) available to the Company's common shareholders		$ 501,385	$ (44,748)	$ 743,316	$ 780,537
Earnings attributable to participating securities		(4,078)	(251)	(5,749)	(5,259)
Net income/(loss) available to the Company’s common shareholders for basic earnings per share		497,307	(44,999)	737,567	775,278
Distributions on convertible units		42	0	3,009	119
Net income/(loss) available to the Company’s common shareholders for diluted earnings per share		$ 497,349	$ (44,999)	$ 740,576	$ 775,397
Weighted average common shares outstanding – basic (in shares)		546,842	429,994	469,885	429,899
Equity awards (in shares)	[1]	1,718	0	1,837	1,496
Assumed conversion of convertible units (in shares)	[1]	206	0	2,730	207
Weighted average common shares outstanding – diluted (in shares)	[1]	548,766	429,994	474,452	431,602
Basic earnings per share (in dollars per share)		$ 0.91	$ (0.10)	$ 1.57	$ 1.80
Diluted earnings per share (in dollars per share)		$ 0.91	$ (0.10)	$ 1.56	$ 1.80

[1] The effect of the assumed conversion of certain convertible units had an anti-dilutive effect upon the calculation of Net income/(loss) available to the Company’s common shareholders per share. Accordingly, the impact of such conversions has not been included in the determination of diluted earnings per share calculations. Additionally, there were 0.5 million and 1.2 million stock options that were not dilutive as of September 30, 2021 and 2020, respectively, and 2.5 million shares of restricted stock that were not dilutive for the three months ended September 30, 2020.