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Debt Obligations - Junior Subordinated Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]          
Deferred financing costs $ 6,962   $ 6,962   $ 6,646
Junior subordinated notes          
Debt Instrument [Line Items]          
Total debt obligations 37,400   37,400   37,400
Deferred financing costs 342   342   $ 357
Interest expense $ 438 $ 416 $ 1,326 $ 1,159  
London Interbank Offered Rate (LIBOR) | Junior subordinated notes          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.00%    
Interest rate 4.26%   4.26%