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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities purchased under agreements to resell | $ 589 | $ 290
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 911,468 | 837,584
Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 1,720 | 2,411
Receivable from customers | 753,625 | 720,777
Fair Value, Estimate Not Practicable, Investment | 67,093 | 59,765
Drafts payable | 13,533 | 16,348
Clearing organizations | 27,874 | 28,777
Securities loaned | 232,370 | 146,815
Fair Value, Estimate not Practicable, Due from Employees | 43,921 | 44,058
Total Receivable from brokers, dealers and clearing organizations | 180,268 | 166,493
Securities failed to receive | 30,064 | 27,799
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,256 | 158
Bank call loans | 0 | 15,000
Securities purchased under agreements to resell | 589 | 290
Receivables from brokers | 17,438 | 20,140
Securities failed to deliver | 23,524 | 7,021
Securities borrowed | 109,712 | 108,144
Deposits with clearing organization | 24,729 | 33,079
Other | 368,684 | 113,628
Total payables to brokers, dealers and clearing organizations | 633,374 | 288,400
Payables to customers | 334,376 | 336,616
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 268,621 | 484,218
Fair Value, Estimate not Practicable, Senior Secured Notes | 203,904 | 199,722
Fair Value, Estimate Not Practicable, Cash | 72,573 | 80,175
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value [Member] |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 1,720 | 2,411
Receivable from customers | 753,625 | 720,777
Fair Value, Estimate Not Practicable, Investment | 67,093 | 59,765
Drafts payable | 13,533 | 16,348
Clearing organizations | 27,874 | 28,777
Securities loaned | 232,370 | 146,815
Fair Value, Estimate not Practicable, Due from Employees | 43,921 | 44,058
Total Receivable from brokers, dealers and clearing organizations | 180,268 | 166,493
Securities failed to receive | 30,064 | 27,799
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,256 | 158
Bank call loans |  | 15,000
Securities purchased under agreements to resell | 589 | 290
Receivables from brokers | 17,438 | 20,140
Securities failed to deliver | 23,524 | 7,021
Securities borrowed | 109,712 | 108,144
Deposits with clearing organization | 24,729 | 33,079
Other | 368,684 | 113,628
Total payables to brokers, dealers and clearing organizations | 633,374 | 288,400
Payables to customers | 334,376 | 336,616
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 268,621 | 484,218
Fair Value, Estimate not Practicable, Senior Secured Notes | 200,000 | 200,000
Fair Value, Estimate Not Practicable, Cash | 72,573 | 80,175
Fair Value, Measurements, Nonrecurring [Member] | Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Drafts payable | 13,533 | 16,348
Deposits with clearing organization | 24,729 | 33,079
Fair Value, Estimate Not Practicable, Cash | 72,573 | 80,175
Fair Value, Measurements, Nonrecurring [Member] | Level 2 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 1,720 | 2,411
Receivable from customers | 753,625 | 720,777
Fair Value, Estimate Not Practicable, Investment | 67,093 | 59,765
Clearing organizations | 27,874 | 28,777
Securities loaned | 232,370 | 146,815
Fair Value, Estimate not Practicable, Due from Employees | 43,921 | 44,058
Total Receivable from brokers, dealers and clearing organizations | 180,268 | 166,493
Securities failed to receive | 30,064 | 27,799
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,256 | 158
Bank call loans |  | 15,000
Securities purchased under agreements to resell | 589 | 290
Receivables from brokers | 17,438 | 20,140
Securities failed to deliver | 23,524 | 7,021
Securities borrowed | 109,712 | 108,144
Other | 368,684 | 113,628
Total payables to brokers, dealers and clearing organizations | 633,374 | 288,400
Payables to customers | 334,376 | 336,616
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 268,621 | 484,218
Fair Value, Estimate not Practicable, Senior Secured Notes | $ 203,904 | $ 199,722

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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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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