SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
SEGMENT INFORMATION
Number of reportable segments | segment									1
Revenue	$ 202,672	$ 197,057	$ 184,101	$ 181,035	$ 160,954	$ 171,494	$ 152,773	$ 132,515	$ 764,865	$ 617,736	$ 384,402
Mortgage Products
SEGMENT INFORMATION
Revenue									242,175	275,910	219,991
Non-mortgage Products
SEGMENT INFORMATION
Revenue									$ 522,690	$ 341,826	$ 164,411