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Business Acquisitions - Supplementary Information on Unaudited Pro Forma Financial Basis (Details) - SRFax - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]    
Revenues $ 332,431 $ 328,351
Net income $ 122,912 $ 180,911
EPS - Basic (in usd per share) $ 6.18 $ 9.09
EPS - Diluted (in usd per share) $ 6.18 $ 9.09