Note 10 - Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 16,600
Unrecognized Tax Benefits, Interest and Penalties Charged to Income		(61,600)	$ 2,200	$ 1,800
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 33,552	123,951	123,028
Tax positions related to the current year [Abstract]
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions		5,058	2,343
Tax positions related to prior years [Abstract]
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions		26,465	24,122
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions		(43,146)	(1,437)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		(52,353)	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations		(26,423)	(24,105)
Balance at end of period		33,552	$ 123,951	$ 123,028
Unrecognized Tax Benefits, Period Increase (Decrease)		$ (90,400)
Scenario, Forecast
Tax positions related to prior years [Abstract]
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	$ (6,500)