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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]  
Calculation Of Basic And Diluted Earnings Per Share
The calculations of basic and diluted earnings per share for the three months ended March 31, 2021 and 2020 are:
 Three Months Ended March 31,
 20212020
Net income$129,470 $109,242 
Shares used to compute basic earnings per common share143,201,000 149,468,000 
Dilutive effect of stock options2,105,000 2,900,000 
Shares used to compute diluted earnings per common share145,306,000 152,368,000 
Basic earnings per common share$0.90 $0.73 
Diluted earnings per common share$0.89 $0.72 
Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities
The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the three months ended March 31:
20212020
Net income$129,470 $109,242 
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation8,309 7,473 
Amortization14,352 13,077 
Equity in earnings of unconsolidated affiliate(33,350)(29,907)
Distributions received from unconsolidated affiliate28,774 40,226 
Stock-based compensation9,752 6,929 
Provision for losses on receivables1,207 80 
Deferred income tax expense(3,915)(1,879)
Net (gain) loss from investments(332)3,989 
Change in other long-term liabilities1,043 360 
Change in other assets507 (4,658)
Contract costs capitalized, net of amortization351 (1,769)
Other992 (1,612)
Change in current assets and liabilities
(Increase) decrease in
Receivables from investment products(2,020)2,553 
Receivables(22,016)(17,852)
Other current assets(4,113)(9,728)
Advances due from unconsolidated affiliate51,266 11,810 
(Decrease) increase in
Accounts payable(2,237)8,663 
Accrued liabilities(41,717)(36,818)
Deferred revenue250 (1,207)
Total adjustments7,103 (10,270)
Net cash provided by operating activities$136,573 $98,972