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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

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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