Note 5 - 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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance		$ 2,014,849	$ 1,949,879	$ 1,998,461	$ 1,941,437
Balance		1,979,294	1,959,855	1,979,294	1,959,855
Cross Currency Swap [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member]
Balance		3,840	568	5,745	3,366
Gain or (loss) recognized in Other comprehensive income (loss)	[1]	(30,828)	7,006	(39,415)	(6,894)
Amount reclassified from Other comprehensive income (loss) into earnings		28,733	(6,808)	35,415	4,294
Balance		$ 1,745	$ 766	$ 1,745	$ 766

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