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Borrowings - Broker-Dealer Credit Facilities (Details) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 03, 2017 USD ($) borrowing_base broker_dealer | Mar. 31, 2018 USD ($) broker_dealer subsidiary | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Nov. 02, 2017 USD ($)
Long-Term Borrowings |  |  |  |  |
Number of borrowing bases | borrowing_base | 2 |  |  |  |
Number of broker-dealer subsidiaries | 3 | 3 |  |  |
Borrowing Outstanding |  | $ 1,156,932,000 |  |  |
Outstanding Borrowings, net |  | 1,121,464,000 |  | $ 1,388,548,000 |
Interest expense |  | $ 19,047,000 | $ 6,828,000 |  |
LIBOR rate |  |  |  |  |
Long-Term Borrowings |  |  |  |  |
Interest rate margin (as a percent) | 1.25% |  |  |  |
Broker-Dealer Credit Facilities |  |  |  |  |
Long-Term Borrowings |  |  |  |  |
Number of secured credit facilities | broker_dealer |  | 2 |  |  |
Financing Available | $ 500,000,000 | $ 850,000,000 |  | 650,000,000 | $ 25,000,000
Maximum borrowing capacity | $ 100,000,000 |  |  |  | $ 40,000,000
Number of broker-dealer subsidiaries the committed facility is available to | broker_dealer | 2 |  |  |  |
Commitment fee (as a percent) | 0.50% |  |  |  |
Borrowing Outstanding |  | 24,500,000 |  | 32,000,000 |
Deferred Debt Issuance Cost |  | (3,556,000) |  | (4,117,000) |
Outstanding Borrowings, net |  | 20,944,000 |  | 27,883,000 |
Interest expense |  | $ 544,000 | 422,000 |  |
Broker-Dealer Credit Facilities | LIBOR rate |  |  |  |  |
Long-Term Borrowings |  |  |  |  |
Interest rate margin (as a percent) | 2.50% |  |  |  |
Broker-Dealer Credit Facility on an uncommitted basis |  |  |  |  |
Long-Term Borrowings |  |  |  |  |
Number of secured credit facilities | broker_dealer |  | 1 |  |  |
Financing Available |  | $ 350,000,000 |  | $ 150,000,000 |
Interest rate (as a percent) |  | 2.68% |  | 2.42% |
Borrowing Outstanding |  | $ 17,500,000 |  | $ 25,000,000 |
Deferred Debt Issuance Cost |  | (1,580,000) |  | 0 |
Outstanding Borrowings, net |  | 15,920,000 |  | 25,000,000 |
Interest expense |  | 446,000 | 415,000 |  |
Broker-Dealer Credit Facility on committed basis |  |  |  |  |
Long-Term Borrowings |  |  |  |  |
Interest expense |  | 0 | 7,000 |  |
Revolving credit facility |  |  |  |  |
Long-Term Borrowings |  |  |  |  |
Financing Available |  | $ 500,000,000 |  | $ 500,000,000 |
Interest rate (as a percent) |  | 3.13% |  | 2.81% |
Borrowing Outstanding |  | $ 7,000,000 |  | $ 7,000,000 |
Deferred Debt Issuance Cost |  | (1,976,000) |  | (4,117,000) |
Outstanding Borrowings, net |  | 5,024,000 |  | $ 2,883,000 |
Interest expense |  | $ 98,000 | $ 0 |  |

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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/presentationRef -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 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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