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Segment and Related Information - Reconciliation of Operating Income from Segments to Consolidated (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information    
Total segment operating income $ 38,208 $ 33,893
Amortization of acquired software (150,595) (147,410)
Amortization of customer and trade name intangibles (5,412) (5,392)
Other income, net 88 990
Income before income taxes 38,296 34,883
Acquired software    
Segment Reporting Information    
Amortization of acquired software (7,964) (8,027)
Operating segment and corporate non-segment    
Segment Reporting Information    
Total segment operating income $ 51,584 $ 47,312