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Business Combinations Business Combination Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |
Business Acquisition, Pro Forma Revenue | $ 157,422 | $ 150,909
Business Acquisition, Pro Forma Net Income (Loss) | $ 52,207 | $ 54,616
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 3.20 | $ 3.29
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 3.18 | $ 3.27

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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