Note 23 - Earnings Per Share - Reconciliation of Earnings (Loss) and the Weighted Average Number of Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income available to the Company's common shareholders		$ 975,417	$ 339,988	$ 439,604
Change in estimated redemption value of redeemable noncontrolling interests		2,160	0	(7,521)
Earnings attributable to participating securities		(6,347)	(2,599)	(2,375)
Net income available to the Company’s common shareholders for basic earnings per share		971,230	337,389	429,708
Distributions on convertible units		161	30	99
Net income available to the Company’s common shareholders for diluted earnings per share		$ 971,391	$ 337,419	$ 429,807
Weighted average common shares outstanding – basic (in shares)		429,950	420,370	420,641
Equity awards (in shares)	[1]	1,475	1,365	628
Assumed conversion of convertible units (in shares)	[1]	208	64	110
Weighted average common shares outstanding – diluted (in shares)	[1]	431,633	421,799	421,379
Basic earnings per share (in dollars per share)		$ 2.26	$ 0.80	$ 1.02
Diluted earnings per share (in dollars per share)		$ 2.25	$ 0.80	$ 1.02

[1] The effect of the assumed conversion of certain convertible units had an anti-dilutive effect upon the calculation of Income from continuing operations per share. Accordingly, the impact of such conversions has not been included in the determination of diluted earnings per share calculations. Additionally, there were 1.2 million, 0.5 million and 1.3 million stock options that were not dilutive as of December 31, 2020, 2019 and 2018, respectively.