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Summary of Significant Accounting Policies - Net Cash Provided by Operating Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accounting Policies [Abstract] |  |  |  |
Net income | $ 154,900 | $ 115,661 | $ 425,420 | $ 341,527
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 8,341 | 9,197 | 25,097 | 26,509
Amortization | 10,413 | 9,797 | 31,284 | 28,851
Equity in earnings of unconsolidated affiliate | (36,513) | (29,927) | (102,375) | (91,517)
Distributions received from unconsolidated affiliate |  |  | 112,476 | 100,252
Stock-based compensation | 13,696 | 7,979 | 37,224 | 23,458
Provision for losses on receivables |  |  | 1,170 | 283
Deferred income tax expense |  |  | (21,051) | (20,971)
Net gain from investments | $ (427) | $ 206 | (3,349) | (1,053)
Net gain from sale of property |  |  | (8,151) | 0
Change in other long-term liabilities |  |  | 3,205 | 3,105
Change in other assets |  |  | (4,005) | 1,099
Contract costs capitalized, net of amortization |  |  | (2,306) | (590)
Other |  |  | (2,900) | 2,122
Change in current assets and liabilities (Increase) decrease in |  |  |  |
Receivables from investment products |  |  | 1,301 | 6,327
Receivables |  |  | (109,522) | (62,053)
Other current assets |  |  | 606 | (8,654)
Advances due from unconsolidated affiliate |  |  | 51,005 | 51,293
Accounts payable |  |  | (2,364) | (3,085)
Accrued liabilities |  |  | (1,655) | (48,128)
Deferred revenue |  |  | (4,036) | (2,793)
Total adjustments |  |  | 1,654 | 4,455
Net cash provided by operating activities |  |  | $ 427,074 | $ 345,982

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