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Debt - Preferred Equity Certificates (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2013 GBP (£) shares | Jul. 01, 2013 USD ($) shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jul. 01, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Business combination, aggregate purchase price | $ |  |  | $ 49,400 | $ 59,400 |
Preferred equity certificates | $ |  |  | $ 221,516 | $ 208,312 |
Preferred Equity Certificate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate |  |  | 12.00% |  |
Cabot [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of equity interest acquired | 50.10% |  |  |  | 50.10%
Janus Holdings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Minority interest percentage | 49.90% |  |  |  | 49.90%
Cabot [Member] | Common Class A [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, number of shares still held by minority interest | 100 | 100 |  |  |
Cabot [Member] | Janus Holdings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, aggregate purchase price | £ 115,100,000 | $ 175,000 |  |  |
Cabot [Member] | Janus Holdings [Member] | Common Class E [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, number of shares acquired | 3,498,563 | 3,498,563 |  |  |
Cabot [Member] | E Bridge Preferred Equity Certificates [Member] | Janus Holdings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, preferred equity certificates acquired (amount) | £ 10,218,574 |  |  |  | $ 15,500
Cabot [Member] | E Preferred Equity Certificates [Member] | Janus Holdings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, preferred equity certificates acquired (amount) | £ 96,729,661 |  |  |  | 147,100
Cabot Holdings [Member] | Common Class A [Member] | J C Flowers And Company Limited Liability Company [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, number of shares acquired | 100 | 100 |  |  |
Cabot Holdings [Member] | Janus Holdings [Member] | Common Class J [Member] | J C Flowers And Company Limited Liability Company [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, number of shares still held by minority interest | 3,484,597 | 3,484,597 |  |  |
Cabot Holdings [Member] | J Bridge PECs [Member] | Janus Holdings [Member] | J C Flowers And Company Limited Liability Company [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, preferred equity certificates acquired (amount) | £ 10,177,781 |  |  |  | 15,500
Cabot Holdings [Member] | J Preferred Equity Certificates [Member] | Janus Holdings [Member] | J C Flowers And Company Limited Liability Company [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business combination, financial liabilities still held by minority interest (amount) | £ 96,343,515 |  |  |  | $ 146,500

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