Note 14 - 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
		Mar. 31, 2021	Mar. 31, 2020
Net income available to the Company's common shareholders		$ 131,588	$ 83,746
Earnings attributable to participating securities		(792)	(686)
Net income available to the Company’s common shareholders for basic earnings per share		130,796	83,060
Distributions on convertible units		9	0
Net income available to the Company’s common shareholders for diluted earnings per share		$ 130,805	$ 83,060
Weighted average common shares outstanding – basic (in shares)		430,524	429,735
Equity awards (in shares)	[1]	1,606	717
Assumed conversion of convertible units (in shares)	[1]	134	53
Weighted average common shares outstanding – diluted (in shares)	[1]	432,264	430,505
Basic earnings per share (in dollars per share)		$ 0.30	$ 0.19
Diluted earnings per share (in dollars per share)		$ 0.30	$ 0.19

[1] The effect of the assumed conversion of certain convertible units had an anti-dilutive effect upon the calculation of Net income 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 0.8 million and 1.2 million stock options that were not dilutive as of March 31, 2021 and 2020, respectively.