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		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income available to the Company's common shareholders		$ 110,343	$ 741,539	$ 241,931	$ 825,285
Earnings attributable to participating securities		(672)	(5,253)	(1,475)	(5,687)
Net income available to the Company’s common shareholders for basic earnings per share		109,671	736,286	240,456	819,598
Distributions on convertible units		9	33	18	81
Net income available to the Company’s common shareholders for diluted earnings per share		$ 109,680	$ 736,319	$ 240,474	$ 819,679
Weighted average common shares outstanding – basic (in shares)		431,011	429,967	430,769	429,851
Equity awards (in shares)	[1]	1,356	970	1,528	1,469
Assumed conversion of convertible units (in shares)	[1]	122	233	133	207
Weighted average common shares outstanding – diluted (in shares)	[1]	432,489	431,170	432,430	431,527
Basic earnings per share (in dollars per share)		$ 0.25	$ 1.71	$ 0.56	$ 1.91
Diluted earnings per share (in dollars per share)		$ 0.25	$ 1.71	$ 0.56	$ 1.90

[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 0.5 million and 1.2 million stock options that were not dilutive as of June 30, 2021 and 2020, respectively.