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Debt - Preferred Equity Certificates (Details) $ in Thousands | Jul. 01, 2013 USD ($) shares | Jul. 01, 2013 GBP (£) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jul. 01, 2013 GBP (£)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Preferred equity certificates | $ |  |  | $ 253,324 | $ 205,975 |
Preferred Equity Certificate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate |  |  | 12.00% |  |
Cabot |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of equity interest acquired | 50.10% |  |  |  | 50.10%
Janus Holdings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Minority interest percentage | 49.90% |  |  |  | 49.90%
Cabot | Common Class A |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, number of shares still held by minority interest | 100 | 100 |  |  |
Cabot | Janus Holdings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, aggregate purchase price | $ 175,000 | £ 115,100,000 |  |  |
Cabot | Janus Holdings | Common Class E |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, number of shares acquired | 3,498,563 | 3,498,563 |  |  |
Cabot | E Bridge Preferred Equity Certificates | Janus Holdings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, preferred equity certificates acquired (amount) | $ 15,500 |  |  |  | £ 10,218,574
Cabot | E Preferred Equity Certificates | Janus Holdings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, preferred equity certificates acquired (amount) | $ 147,100 |  |  |  | 96,729,661
Cabot Holdings | Common Class A | J C Flowers and Company Limited Liability Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, number of shares acquired | 100 | 100 |  |  |
Cabot Holdings | Janus Holdings | Common Class J | J C Flowers and Company Limited Liability Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, number of shares still held by minority interest | 3,484,597 | 3,484,597 |  |  |
Cabot Holdings | J Bridge PECs | Janus Holdings | J C Flowers and Company Limited Liability Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, preferred equity certificates acquired (amount) | $ 15,500 |  |  |  | 10,177,781
Cabot Holdings | J Preferred Equity Certificates | Janus Holdings | J C Flowers and Company Limited Liability Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, financial liabilities still held by minority interest (amount) | $ 146,500 |  |  |  | £ 96,343,515

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