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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accounting Policies [Abstract] |  |  |  |
Net income | $ 139,120 | $ 118,851 | $ 270,520 | $ 225,866
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 8,367 | 8,781 | 16,756 | 17,312
Amortization | 10,485 | 9,630 | 20,871 | 19,054
Equity in earnings of unconsolidated affiliate | (34,219) | (32,711) | (65,862) | (61,590)
Distributions received from unconsolidated affiliate |  |  | 71,478 | 61,452
Stock-based compensation | 12,469 | 7,405 | 23,528 | 15,479
Provision for losses on receivables |  |  | 882 | 35
Deferred income tax expense |  |  | (14,539) | (12,600)
Net gain from investments | $ (666) | $ (515) | (2,922) | (1,259)
Change in other long-term liabilities |  |  | 2,452 | 1,946
Change in other assets |  |  | (5,960) | (71)
Contract costs capitalized, net of amortization |  |  | 246 | (633)
Other |  |  | (1,375) | 2,443
Change in current assets and liabilities (Increase) decrease in |  |  |  |
Receivables from investment products |  |  | 7,923 | 5,710
Receivables |  |  | (89,070) | (64,551)
Other current assets |  |  | (1,068) | (6,907)
Advances due from unconsolidated affiliate |  |  | 51,942 | 50,493
(Decrease) increase in |  |  |  |
Accounts payable |  |  | (1,415) | (6,063)
Accrued liabilities |  |  | (54,188) | (63,682)
Deferred revenue |  |  | (3,169) | 20
Total adjustments |  |  | (43,490) | (43,412)
Net cash provided by operating activities |  |  | $ 227,030 | $ 182,454

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