SERVICER ADVANCE INVESTMENTS - Summary of Information on the Assets and Liabilities related to Consolidated VIE (Details) - VIE - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Servicer advance investments, at fair value	$ 713,239	$ 1,002,102
Cash and cash equivalents	29,833	40,929
All other assets	10,223	13,011
Total assets	753,295	1,056,042
Liabilities
Notes and bonds payable	556,340	789,979
All other liabilities	2,442	3,308
Total liabilities	$ 558,782	$ 793,287