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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Schedule of Calculation of Basic and Diluted Earnings Per Share
The calculations of basic and diluted earnings per share for the three months ended March 31, 2022 and 2021 are:
 Three Months Ended March 31,
 20222021
Net income$190,308 $129,470 
Shares used to compute basic earnings per common share137,935,000 143,201,000 
Dilutive effect of stock options1,777,000 2,105,000 
Shares used to compute diluted earnings per common share139,712,000 145,306,000 
Basic earnings per common share$1.38 $0.90 
Diluted earnings per common share$1.36 $0.89 
Schedule of 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:
20222021
Net income$190,308 $129,470 
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation8,098 8,309 
Amortization16,887 14,352 
Equity in earnings of unconsolidated affiliate(32,459)(33,350)
Distributions received from unconsolidated affiliate32,961 28,774 
Stock-based compensation10,566 9,752 
Provision for losses on receivables(214)1,207 
Deferred income tax expense(10,908)(3,915)
Net loss (gain) from investments489 (332)
Change in other long-term liabilities1,138 1,043 
Change in other assets(706)507 
Contract costs capitalized, net of amortization389 351 
Other1,228 992 
Change in current assets and liabilities
(Increase) decrease in
Receivables from investment products1,452 (2,020)
Receivables3,979 (22,016)
Other current assets(2,556)(4,113)
Advances due from unconsolidated affiliate54,636 51,266 
(Decrease) increase in
Accounts payable(2,273)(2,237)
Accrued liabilities(18,078)(41,717)
Deferred revenue5,490 250 
Total adjustments70,119 7,103 
Net cash provided by operating activities$260,427 $136,573