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SUBSEQUENT EVENT (Details) - USD ($) $ in Thousands		1 Months Ended
SUBSEQUENT EVENT (Details) - USD ($) $ in Thousands	Jun. 21, 2019	Jan. 31, 2016	Jul. 21, 2019	Jun. 30, 2019	Dec. 31, 2018	May 31, 2017
Subsequent Event [Line Items]
Assets				$ 980,598	$ 896,115
Annual interest rate on convertible senior notes						0.625%
Home Loan Center, Inc.
Subsequent Event [Line Items]
Dividends		$ 40,000
Subsequent Event \| Home Loan Center, Inc.
Subsequent Event [Line Items]
Assets			$ 11,400
Cash			$ 5,900
Residential Funding Co. v Home Loan Center \| Judicial Ruling
Subsequent Event [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 68,500