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Revenue and Related Matters - Schedule of Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Assets: |  |  |
Fees receivable, gross | $ 1,184,426 |  | $ 1,251,508
Contract assets recorded in Prepaid expenses and other current assets | 19,883 |  | 14,440
Contract liabilities: |  |  |
Deferred revenues (current liability) | 2,088,463 |  | 1,974,548
Non-current deferred revenues recorded in Other liabilities | 25,852 |  | 26,754
Total contract liabilities | 2,114,315 |  | $ 2,001,302
Revenue recognized previously attributable to deferred revenues | $ 726,700 | $ 658,400 |

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