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