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Note 9 - Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 855,228	$ 805,284
Acquisitions of businesses, net	578,061	42,722
Foreign currency translation	(23,615)	7,222
Balance	1,409,674	855,228
Goodwill, gross	1,917,478	1,363,032
Accumulated impairment	(507,804)	(507,804)
Goodwill	1,409,674	855,228
Domestic [Member]
Balance	702,535	659,209
Acquisitions of businesses, net	293,614	42,722
Foreign currency translation	(705)	604
Balance	995,444	702,535
Goodwill, gross	1,498,637	1,205,728
Accumulated impairment	(503,193)	(503,193)
Goodwill	995,444	702,535
International [Member]
Balance	152,693	146,075
Acquisitions of businesses, net	284,447	0
Foreign currency translation	(22,910)	6,618
Balance	414,230	152,693
Goodwill, gross	418,841	157,304
Accumulated impairment	(4,611)	(4,611)
Goodwill	$ 414,230	$ 152,693

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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