Note 4 - Fair Value of Financial Instruments - Effect of Cash Flow Hedge on Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Balance		$ 2,407,042	$ 1,979,294	$ 2,020,975	$ 1,998,461
Balance		2,405,028	1,992,276	2,405,028	1,992,276
Cross Currency Swap [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member]
Balance		993	1,745	3,920	5,745
Gain or (loss) recognized in Other comprehensive income (loss)	[1]	2,262	(3,338)	9,888	(42,753)
Amount reclassified from Other comprehensive income (loss) into earnings		(7,011)	3,121	(17,564)	38,536
Balance		$ (3,756)	$ 1,528	$ (3,756)	$ 1,528

[1] The amount of gain or (loss) recognized in Other comprehensive income (loss) for the years ended December 31, 2022, 2021 and 2020 is net of tax of $0.5 million, $0.8 million and $1.1 million, respectively.