INVESTMENTS - Mortgage-backed Securities (Details) - Mortgage-backed securities	6 Months Ended
	Jun. 30, 2015
30-59 day delinquent loans
Key assumptions for mortgage-backed securities
Default rate projection (as a percent)	25.00%
60-90 day deliquent loans
Key assumptions for mortgage-backed securities
Default rate projection (as a percent)	70.00%
91+ day deliquent loans
Key assumptions for mortgage-backed securities
Default rate projection (as a percent)	100.00%
Current loans
Key assumptions for mortgage-backed securities
Default rate projection (as a percent)	10.00%