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SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Revenue | $ 100,841 | $ 94,558 | $ 94,290 | $ 94,713 | $ 78,341 | $ 69,804 | $ 55,136 | $ 50,935 | $ 384,402 | $ 254,216 | $ 167,350
Mortgage Products [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 219,991 | 165,272 | 134,137
Non-mortgage Products [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 164,411 | $ 88,944 | $ 33,213

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