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Borrowings - Broker-Dealer Credit Facilities (Details) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) item | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Oct. 27, 2016 USD ($) | Jul. 18, 2016 USD ($) | Apr. 15, 2015 USD ($)
Long-Term Borrowings |  |  |  |  |  |
Borrowing Outstanding | $ 570,071 |  |  |  |  |
Borrowing Outstanding, net | $ 565,317 |  | $ 564,957 |  |  |
Number of broker-dealer subsidiaries | item | 2 |  |  |  |  |
Interest expense | $ 6,828 | $ 7,101 |  |  |  |
Broker-Dealer Credit Facilities |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Financing Available | 200,000 |  | 200,000 |  |  |
Borrowing Outstanding | $ 22,000 |  | 25,000 |  |  |
Number of secured credit facilities | item | 2 |  |  |  |  |
Broker-Dealer Credit Facility on an uncommitted basis |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Financing Available | $ 125,000 |  | 125,000 |  |  |
Borrowing Outstanding | 22,000 |  | $ 25,000 |  |  |
Maximum borrowing capacity | $ 125,000 |  |  |  |  |
Interest rate (as a percent) | 1.91% |  | 1.66% |  |  |
Interest expense | $ 400 | 300 |  |  |  |
Broker-Dealer Credit Facility on committed basis |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Financing Available | $ 75,000 |  | $ 75,000 |  |  |
Maximum borrowing capacity |  |  |  |  | $ 75,000 |
Credit facility term | 364 days |  |  |  |  |
Broker-Dealer Credit Facility on committed basis | LIBOR rate |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Interest rate margin (as a percent) | 1.25% |  |  |  |  |
Broker-Dealer Credit Facility on committed basis | Base rate |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Interest rate margin (as a percent) | 1.25% |  |  |  |  |
Short-Term Credit Facilities |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Financing Available | $ 493,000 |  | 493,000 |  |  |
Borrowing Outstanding | 241,324 |  | 309,086 |  |  |
Interest expense | 1,700 | $ 1,700 |  |  |  |
Total Short-term credit facilities |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Financing Available | 493,000 |  | 493,000 |  |  |
Borrowing Outstanding | 241,324 |  | 309,086 |  |  |
Senior Secured Credit Facility |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Borrowing Outstanding | 538,650 |  | 540,000 |  |  |
Borrowing Outstanding, net | 533,961 |  | 535,104 |  |  |
Maximum borrowing capacity |  |  |  | $ 100,000 |  |
Revolving credit facility |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Unused Available Capacity | 100,000 |  | 100,000 |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 100,000
Total Long-term borrowings |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Borrowing Outstanding, net | 565,317 |  | 564,957 |  |  |
Unused Available Capacity | 100,000 |  | 100,000 |  |  |
SBI Bonds |  |  |  |  |  |
Long-Term Borrowings |  |  |  |  |  |
Borrowing Outstanding | 31,421 |  | 29,925 |  |  |
Borrowing Outstanding, net | $ 31,356 |  | $ 29,853 |  |  |

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