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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts Receivable, Allowances | $ 1,943 | $ 6,037
Furniture, Equipment and Leasehold Improvements, Accumulated Depreciation and Amortization | 108,382 | 89,494
Intangible Assets, Accumulated Amortization | 48,115 | 41,217
Commitments and Contingencies (Note 17) |  |
Treasury Stock at Cost, Shares | 29,137,838 | 26,123,438
Class A [Member] |  |
Common Stock, Par Value (in dollars per share) | $ 0.01 | $ 0.01
Common Stock, Shares Authorized | 1,000,000,000 | 1,000,000,000
Common Stock, Shares Issued | 68,573,861 | 65,872,014
Common Stock, Shares Outstanding | 39,436,023 | 39,748,576
Class B [Member] |  |
Common Stock, Par Value (in dollars per share) | $ 0.01 | $ 0.01
Common Stock, Shares Authorized | 1,000,000 | 1,000,000
Common Stock, Shares Issued | 87 | 86
Common Stock, Shares Outstanding | 87 | 86

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