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		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balance		$ 2,337,029	$ 2,014,849	$ 2,020,975	$ 1,998,461
Balance		2,407,042	1,979,294	2,407,042	1,979,294
Cross Currency Swap [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member]
Balance		(1,483)	3,840	3,920	5,745
Gain or (loss) recognized in Other comprehensive income (loss)	[1]	6,238	(30,828)	7,627	(39,415)
Amount reclassified from Other comprehensive income (loss) into earnings		(3,761)	28,733	(10,553)	35,415
Balance		$ 994	$ 1,745	$ 994	$ 1,745

[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.