ACQUISITIONS - RentRange, Investability and Onit Solutions (Details) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
	Oct. 09, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2016
Acquisitions
Value of common stock paid at acquisition		$ 0	$ 21,733	$ 0
Goodwill		$ 86,283	$ 82,801	$ 90,851
RentRange, Investability and Onit Solutions
Acquisitions
Business combination, consideration transferred	$ 24,800
Cash paid at closing	17,500
Value of common stock paid at acquisition	$ 7,300
Contingent consideration arrangements, payment period	4 years
Number of shares exchanged for acquisition, no longer restricted		55
Cash					$ 3
Accounts receivable, net					169
Premises and equipment, net					1,404
Other assets					3
Trademarks and trade names					1,205
Databases/other					1,945
Non-compete agreements					330
Customer relationships					255
Goodwill					19,615
Assets acquired					24,929
Accounts payable and accrued expenses					(345)
Purchase price					24,584
RentRange, Investability and Onit Solutions | Initial purchase price allocation
Acquisitions
Cash	$ 3
Accounts receivable, net	245
Premises and equipment, net	2,471
Other assets	199
Trademarks and trade names	1,205
Databases/other	910
Non-compete agreements	330
Customer relationships	255
Goodwill	19,565
Assets acquired	25,183
Accounts payable and accrued expenses	(391)
Purchase price	$ 24,792
RentRange, Investability and Onit Solutions | Adjustments
Acquisitions
Cash					0
Accounts receivable, net					(76)
Premises and equipment, net					(1,067)
Other assets					(196)
Trademarks and trade names					0
Databases/other					1,035
Non-compete agreements					0
Customer relationships					0
Goodwill					50
Assets acquired					(254)
Accounts payable and accrued expenses					46
Purchase price					$ (208)
Restricted Stock Units (RSUs) | RentRange, Investability and Onit Solutions
Acquisitions
Number of shares exchanged for acquisition	247
Value of common stock paid at acquisition	$ 7,300