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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Amortization Expense Related to the SEI Wealth Platform The Company currently expects to recognize amortization expense related to all capitalized software development costs placed into service as of December 31, 2018 each year from 2019 through 2023 as follows:
2019
$
46,608

2020
46,608

2021
46,330

2022
31,817

2023
13,145
Calculation Of Basic And Diluted Earnings Per Share The calculations of basic and diluted earnings per share for 2018, 2017 and 2016 are:
 
 
2018
 
2017
 
2016
Net income
 
$
505,868

 
$
404,389

 
$
333,817

Shares used to compute basic earnings per common share
 
156,579,000

 
158,177,000

 
161,350,000

Dilutive effect of stock options
 
4,653,000

 
4,092,000

 
3,081,000

Shares used to compute diluted earnings per common share
 
161,232,000

 
162,269,000

 
164,431,000

Basic earnings per common share
 
$
3.23

 
$
2.56

 
$
2.07

Diluted earnings per common share
 
$
3.14

 
$
2.49

 
$
2.03