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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