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Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accumulated depreciation (in dollars) | $ 112,092 | $ 113,184
Fair value of other assets (in dollars) | $ 38,055 | $ 36,480
Treasury stock shares | 453,066 | 453,066
Class A |  |
Common stock, par value (in dollars per share) | $ 0.00001 | $ 0.00001
Common stock shares authorized | 1,000,000,000 | 1,000,000,000
Common stock shares issued | 41,120,342 | 40,436,580
Common stock shares outstanding | 40,667,276 | 39,983,514
Class B |  |
Common stock, par value (in dollars per share) | $ 0.00001 | $ 0.00001
Common stock shares authorized | 175,000,000 | 175,000,000
Common stock shares issued | 0 | 0
Common stock shares outstanding | 0 | 0
Class C |  |
Common stock, par value (in dollars per share) | $ 0.00001 | $ 0.00001
Common stock shares authorized | 90,000,000 | 90,000,000
Common stock shares issued | 19,081,435 | 19,810,707
Common stock shares outstanding | 19,081,435 | 19,810,707
Class D |  |
Common stock, par value (in dollars per share) | $ 0.00001 | $ 0.00001
Common stock shares authorized | 175,000,000 | 175,000,000
Common stock shares issued | 79,610,490 | 79,610,490
Common stock shares outstanding | 79,610,490 | 79,610,490

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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