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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | $ 999,627 | $ 926,597
Securities purchased under agreements to resell, at fair value | 0 | 658
Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Cash | 32,225 | 37,664
Deposits with clearing organization | 29,551 | 7,929
Securities borrowed | 112,272 | 132,368
Receivables from brokers | 15,333 | 19,298
Securities failed to deliver | 16,862 | 9,442
Clearing organizations | 24,296 | 24,361
Other | 2,007 | 930
Total Receivable from brokers, dealers and clearing organizations | 170,770 | 186,399
Receivable from customers | 881,941 | 848,226
Securities purchased under agreements to resell, at fair value |  | 658
Fair Value, Estimate not Practicable, Due from Employees | 42,386 | 40,520
Drafts payable | 20,993 | 42,212
Bank call loans | 147,400 | 118,300
Securities loaned | 174,567 | 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 3,405 | 1,567
Securities failed to receive | 23,677 | 17,559
Other | 51,984 | 10,707
Total payables to brokers, dealers and clearing organizations | 253,633 | 210,103
Payables to customers | 445,085 | 385,907
Securities sold under agreements to repurchase | 576,017 | 586,478
Senior secured notes | 206,488 | 206,380
Fair Value, Estimate Not Practicable, Investments | 65,563 | 65,404
Level 1 | Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Cash | 32,225 | 37,664
Deposits with clearing organization | 29,551 | 7,929
Drafts payable | 20,993 | 42,212
Level 2 | Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Securities borrowed | 112,272 | 132,368
Receivables from brokers | 15,333 | 19,298
Securities failed to deliver | 16,862 | 9,442
Clearing organizations | 24,296 | 24,361
Other | 2,007 | 930
Total Receivable from brokers, dealers and clearing organizations | 170,770 | 186,399
Receivable from customers | 881,941 | 848,226
Securities purchased under agreements to resell, at fair value |  | 658
Fair Value, Estimate not Practicable, Due from Employees | 42,386 | 40,520
Bank call loans | 147,400 | 118,300
Securities loaned | 174,567 | 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 3,405 | 1,567
Securities failed to receive | 23,677 | 17,559
Other | 51,984 | 10,707
Total payables to brokers, dealers and clearing organizations | 253,633 | 210,103
Payables to customers | 445,085 | 385,907
Securities sold under agreements to repurchase | 576,017 | 586,478
Senior secured notes | 206,488 | 206,380
Fair Value, Estimate Not Practicable, Investments | 65,563 | 65,404
Carrying Value [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Cash | 32,225 | 37,664
Deposits with clearing organization | 29,551 | 7,929
Securities borrowed | 112,272 | 132,368
Receivables from brokers | 15,333 | 19,298
Securities failed to deliver | 16,862 | 9,442
Clearing organizations | 24,296 | 24,361
Other | 2,007 | 930
Total Receivable from brokers, dealers and clearing organizations | 170,770 | 186,399
Receivable from customers | 881,941 | 848,226
Securities purchased under agreements to resell, at fair value |  | 658
Fair Value, Estimate not Practicable, Due from Employees | 42,386 | 40,520
Drafts payable | 20,993 | 42,212
Bank call loans | 147,400 | 118,300
Securities loaned | 174,567 | 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 3,405 | 1,567
Securities failed to receive | 23,677 | 17,559
Other | 51,984 | 10,707
Total payables to brokers, dealers and clearing organizations | 253,633 | 210,103
Payables to customers | 445,085 | 385,907
Securities sold under agreements to repurchase | 576,017 | 586,478
Senior secured notes | 200,000 | 200,000
Fair Value, Estimate Not Practicable, Investments | $ 65,563 | $ 65,404

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 5: 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(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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