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Business Acquisitions - Supplementary Information on Unaudited Pro Forma Financial Basis (Details) - SRFax
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenues | $ $ 332,431
Net income from continuing operations | $ $ 122,912
EPS - Basic (in usd per share) | $ / shares $ 6.18
EPS - Diluted (in usd per share) | $ / shares $ 6.18