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Note 7 - Segment Reporting (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019
Number of Reportable Segments			2
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 701,355	$ 601,135	$ 1,724,118	$ 1,613,404
Adjusted EBITDA	$ 178,778	$ 125,953	$ 387,942	$ 324,967
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage	84.00%	78.00%	82.00%	75.00%
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES
Concentration Risk, Percentage			82.00%		80.00%
Amounts Adjusted from the Domestic Segment to the International Segment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total		$ 3,353		$ 10,509
Adjusted EBITDA		$ 384		$ 976

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