MORTGAGE LOANS (Details 2) (Commercial mortgage loans, USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014 item	Mar. 31, 2013	Dec. 31, 2013
Commercial mortgage loans
Mortgage loans
Mortgage loans having participation feature	$ 630,300,000		$ 666,600,000
Income recognized on participating mortgage loans	3,000,000	3,400,000
Nonperforming mortgage loans, foreclosed properties and restructured loans to invested assets (as a percent)	0.03%
Nonperforming mortgage loans, foreclosed properties and restructured loans pursuant to pooling and servicing agreements	14,200,000
Mortgage loans accounted for as troubled debt restructurings	5,800,000
Number of loan categories	2
Loans not subject to a pooling and servicing agreement which are either nonperforming or restructured	12,000,000
Loans subject to a pooling and servicing agreement which are either nonperforming or restructured	2,200,000
Number of nonperforming loans subject to a pooling and servicing agreement which have been restructured	0
Change in the allowance for credit losses
Beginning balance	3,130,000	2,875,000	2,875,000
Charge offs			(6,838,000)
Recoveries	(167,000)		(1,016,000)
Provision	1,542,000		8,109,000
Ending balance	$ 4,505,000		$ 3,130,000