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Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Concentration Risk [Line Items] |  |  |
Securities Purchased under Agreements to Resell | $ 2,191 | $ 7,669 |
Securities Sold Under Agreements to Repurchase | 44,000 | 106,499 |
Accounts Receivable (net of allowances of $1,313 and $1,362 at December 31, 2015 and 2014, respectively) | $ 175,497 | 136,280 |
Investment Banking And Investment Management Receivables Collection Periods | 90 days |  |
Collection Period For Restructuring Transactions And Private Equity Fee Receivables | 90 days |  |
Provision for Doubtful Accounts | $ 1,314 | 1,027 | $ 2,099
Marketable Securities | $ 43,787 | 37,985 |
Percentage Of Marketable Securities Related To Corporate And Municipal Bonds And Other Debt Securities | 86.00% |  |
Percentage Of Marketable Securities Related To Seed Capital Investments And Mutual Funds | 14.00% |  |
Asset (Liability) Balance [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Securities Purchased under Agreements to Resell | $ 2,191 | 7,669 |
Securities Sold Under Agreements to Repurchase | 44,000 | 106,499 |
Market Value Of Collateral Received Or Pledged [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Securities Purchased under Agreements to Resell | 2,192 | 7,671 |
Securities Sold Under Agreements to Repurchase | $ 44,063 | $ 106,632 |

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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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