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Borrowing Facilities (Borrowings Under the Facility) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Credit Facility [Member]    
Total available under the financing arrangement $ 75,000 $ 75,000
Amount borrowed by the Company under the acquisition facility   (1,200)
Amount borrowed by affiliated partnerships and limited liability companies under the venture, acquisition, and warehouse facilities (865) (910)
Total remaining available under the working capital, acquisition and warehouse facilities 74,135 $ 72,890
Warehouse Facility [Member]    
Amount borrowed by the Company under the acquisition facility $ 0