REVENUE REVENUE - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 197,438	$ 240,483
Revenue recognized when services are performed or assets are sold
Disaggregation of Revenue [Line Items]
Revenue	166,956
Revenue related to technology platforms and professional services
Disaggregation of Revenue [Line Items]
Revenue	22,335
Reimbursable expenses revenue
Disaggregation of Revenue [Line Items]
Revenue	8,147	10,029
Operating Segment | Mortgage Market
Disaggregation of Revenue [Line Items]
Revenue	167,338	204,723
Operating Segment | Mortgage Market | Servicer Solutions
Disaggregation of Revenue [Line Items]
Revenue	155,411
Operating Segment | Mortgage Market | Origination Solutions
Disaggregation of Revenue [Line Items]
Revenue	11,927
Operating Segment | Mortgage Market | Revenue recognized when services are performed or assets are sold
Disaggregation of Revenue [Line Items]
Revenue	138,721
Operating Segment | Mortgage Market | Revenue recognized when services are performed or assets are sold | Servicer Solutions
Disaggregation of Revenue [Line Items]
Revenue	129,536
Operating Segment | Mortgage Market | Revenue recognized when services are performed or assets are sold | Origination Solutions
Disaggregation of Revenue [Line Items]
Revenue	9,185
Operating Segment | Mortgage Market | Revenue related to technology platforms and professional services
Disaggregation of Revenue [Line Items]
Revenue	20,959
Operating Segment | Mortgage Market | Revenue related to technology platforms and professional services | Servicer Solutions
Disaggregation of Revenue [Line Items]
Revenue	18,273
Operating Segment | Mortgage Market | Revenue related to technology platforms and professional services | Origination Solutions
Disaggregation of Revenue [Line Items]
Revenue	2,686
Operating Segment | Mortgage Market | Reimbursable expenses revenue
Disaggregation of Revenue [Line Items]
Revenue	7,658
Operating Segment | Mortgage Market | Reimbursable expenses revenue | Servicer Solutions
Disaggregation of Revenue [Line Items]
Revenue	7,602
Operating Segment | Mortgage Market | Reimbursable expenses revenue | Origination Solutions
Disaggregation of Revenue [Line Items]
Revenue	56
Operating Segment | Real Estate Market
Disaggregation of Revenue [Line Items]
Revenue	15,280	20,063
Operating Segment | Real Estate Market | Consumer Real Estate Solutions
Disaggregation of Revenue [Line Items]
Revenue	1,407
Operating Segment | Real Estate Market | Real Estate Investor Solutions
Disaggregation of Revenue [Line Items]
Revenue	13,873
Operating Segment | Real Estate Market | Revenue recognized when services are performed or assets are sold
Disaggregation of Revenue [Line Items]
Revenue	14,803
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	1,405
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	13,398
Operating Segment | Real Estate Market | Revenue related to technology platforms and professional services
Disaggregation of Revenue [Line Items]
Revenue	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
Operating Segment | Real Estate Market | Revenue related to technology platforms and professional services | Real Estate Investor Solutions
Disaggregation of Revenue [Line Items]
Revenue	0
Operating Segment | Real Estate Market | Reimbursable expenses revenue
Disaggregation of Revenue [Line Items]
Revenue	477
Operating Segment | Real Estate Market | Reimbursable expenses revenue | Consumer Real Estate Solutions
Disaggregation of Revenue [Line Items]
Revenue	2
Operating Segment | Real Estate Market | Reimbursable expenses revenue | Real Estate Investor Solutions
Disaggregation of Revenue [Line Items]
Revenue	475
Other Businesses, Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Revenue	14,820	$ 15,697
Other Businesses, Corporate and Eliminations | Revenue recognized when services are performed or assets are sold
Disaggregation of Revenue [Line Items]
Revenue	13,432
Other Businesses, Corporate and Eliminations | Revenue related to technology platforms and professional services
Disaggregation of Revenue [Line Items]
Revenue	1,376
Other Businesses, Corporate and Eliminations | Reimbursable expenses revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 12