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Borrowings - Broker-Dealer Credit Facilities Carrying Values, Net (Details) - USD ($) | Mar. 31, 2019 | Mar. 01, 2019 | Dec. 31, 2018 | Nov. 03, 2017
--- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |
Borrowing Outstanding | $ 2,031,571,000 |  |  |
Outstanding Borrowings, net | $ 1,977,716,000 |  | $ 907,037,000 |
Uncommitted facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest Rate | 3.40% |  | 3.40% |
Financing Available | $ 200,000,000 |  | $ 200,000,000 |
Borrowing Outstanding | 10,000,000 |  | 10,000,000 |
Deferred Debt Issuance Cost | (708,000) |  | (832,000) |
Outstanding Borrowings, net | $ 9,292,000 |  | $ 9,168,000 |
Committed facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest Rate | 3.74% |  | 3.75% |
Financing Available | $ 600,000,000 |  | $ 500,000,000 |
Borrowing Outstanding | 7,000,000 |  | 7,000,000 |
Deferred Debt Issuance Cost | (930,000) |  | (1,040,000) |
Outstanding Borrowings, net | 6,070,000 |  | 5,960,000 |
Broker-dealer credit facilities |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Financing Available | 800,000,000 | $ 600,000,000 | 700,000,000 | $ 500,000,000
Borrowing Outstanding | 17,000,000 |  | 17,000,000 |
Deferred Debt Issuance Cost | (1,638,000) |  | (1,872,000) |
Outstanding Borrowings, net | $ 15,362,000 |  | $ 15,128,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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(16)) -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 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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