REVENUE REVENUE - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 218,556	$ 250,685	$ 415,994	$ 491,168
Revenue recognized when services are performed or assets are sold
Disaggregation of Revenue [Line Items]
Revenue	187,206		354,162
Revenue related to technology platforms and professional services
Disaggregation of Revenue [Line Items]
Revenue	22,342		44,677
Reimbursable expenses revenue
Disaggregation of Revenue [Line Items]
Revenue	9,008	11,891	17,155	21,920
Operating Segment | Mortgage Market
Disaggregation of Revenue [Line Items]
Revenue	178,662	210,195	346,000	414,918
Operating Segment | Mortgage Market | Servicer Solutions
Disaggregation of Revenue [Line Items]
Revenue	166,069		321,480
Operating Segment | Mortgage Market | Origination Solutions
Disaggregation of Revenue [Line Items]
Revenue	12,593		24,520
Operating Segment | Mortgage Market | Revenue recognized when services are performed or assets are sold
Disaggregation of Revenue [Line Items]
Revenue	149,327		288,048
Operating Segment | Mortgage Market | Revenue recognized when services are performed or assets are sold | Servicer Solutions
Disaggregation of Revenue [Line Items]
Revenue	139,084		268,620
Operating Segment | Mortgage Market | Revenue recognized when services are performed or assets are sold | Origination Solutions
Disaggregation of Revenue [Line Items]
Revenue	10,243		19,428
Operating Segment | Mortgage Market | Revenue related to technology platforms and professional services
Disaggregation of Revenue [Line Items]
Revenue	20,817		41,776
Operating Segment | Mortgage Market | Revenue related to technology platforms and professional services | Servicer Solutions
Disaggregation of Revenue [Line Items]
Revenue	18,525		36,798
Operating Segment | Mortgage Market | Revenue related to technology platforms and professional services | Origination Solutions
Disaggregation of Revenue [Line Items]
Revenue	2,292		4,978
Operating Segment | Mortgage Market | Reimbursable expenses revenue
Disaggregation of Revenue [Line Items]
Revenue	8,518		16,176
Operating Segment | Mortgage Market | Reimbursable expenses revenue | Servicer Solutions
Disaggregation of Revenue [Line Items]
Revenue	8,460		16,062
Operating Segment | Mortgage Market | Reimbursable expenses revenue | Origination Solutions
Disaggregation of Revenue [Line Items]
Revenue	58		114
Operating Segment | Real Estate Market
Disaggregation of Revenue [Line Items]
Revenue	24,145	25,130	39,425	45,193
Operating Segment | Real Estate Market | Consumer Real Estate Solutions
Disaggregation of Revenue [Line Items]
Revenue	2,312		3,719
Operating Segment | Real Estate Market | Real Estate Investor Solutions
Disaggregation of Revenue [Line Items]
Revenue	21,833		35,706
Operating Segment | Real Estate Market | Revenue recognized when services are performed or assets are sold
Disaggregation of Revenue [Line Items]
Revenue	23,664		38,467
Operating Segment | Real Estate Market | Revenue recognized when services are performed or assets are sold | Consumer Real Estate Solutions
Disaggregation of Revenue [Line Items]
Revenue	2,312		3,717
Operating Segment | Real Estate Market | Revenue recognized when services are performed or assets are sold | Real Estate Investor Solutions
Disaggregation of Revenue [Line Items]
Revenue	21,352		34,750
Operating Segment | Real Estate Market | Revenue related to technology platforms and professional services
Disaggregation of Revenue [Line Items]
Revenue	0		0
Operating Segment | Real Estate Market | Revenue related to technology platforms and professional services | Consumer Real Estate Solutions
Disaggregation of Revenue [Line Items]
Revenue	0		0
Operating Segment | Real Estate Market | Revenue related to technology platforms and professional services | Real Estate Investor Solutions
Disaggregation of Revenue [Line Items]
Revenue	0		0
Operating Segment | Real Estate Market | Reimbursable expenses revenue
Disaggregation of Revenue [Line Items]
Revenue	481		958
Operating Segment | Real Estate Market | Reimbursable expenses revenue | Consumer Real Estate Solutions
Disaggregation of Revenue [Line Items]
Revenue	0		2
Operating Segment | Real Estate Market | Reimbursable expenses revenue | Real Estate Investor Solutions
Disaggregation of Revenue [Line Items]
Revenue	481		956
Other Businesses, Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Revenue	15,749	$ 15,360	30,569	$ 31,057
Other Businesses, Corporate and Eliminations | Revenue recognized when services are performed or assets are sold
Disaggregation of Revenue [Line Items]
Revenue	14,215		27,647
Other Businesses, Corporate and Eliminations | Revenue related to technology platforms and professional services
Disaggregation of Revenue [Line Items]
Revenue	1,525		2,901
Other Businesses, Corporate and Eliminations | Reimbursable expenses revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 9		$ 21