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Revenue and Related Matters - Schedule of Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Fees receivable, gross | $ 1,251,508 | $ 1,334,012
Contract assets recorded in Prepaid expenses and other current assets | 14,440 | 21,350
Contract liabilities: |  |
Deferred revenues (current liability) | 1,974,548 | 1,928,020
Non-current deferred revenues recorded in Other liabilities | 26,754 | 24,409
Total contract liabilities | $ 2,001,302 | $ 1,952,429

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