OFFSETTING OF ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	$ 172,067	$ 113,111
Net Amounts of Assets Presented in the Statement of Financial Position	172,067	113,111
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	41,823	21,565
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	1,000	11,280
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	129,244	80,266
Total derivatives, not subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	3,854	17,317
Net Amounts of Assets Presented in the Statement of Financial Position	3,854	17,317
Total derivatives, not subject to a master netting arrangement or similar arrangement, Net Amount	3,854	17,317
Total derivatives
Gross Amounts of Recognized Assets	175,921	130,428
Net Amounts of Assets Presented in the Statement of Financial Position	175,921	130,428
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	41,823	21,565
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	1,000	11,280
Total derivatives, Net Amount	133,098	97,583
Total Assets
Gross Amounts of Recognized Assets	175,921	130,428
Net Amounts of Assets Presented in the Statement of Financial Position	175,921	130,428
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	41,823	21,565
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	1,000	11,280
Total derivatives, Net Amount	133,098	97,583
Free-Standing derivatives
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	127,764	81,520
Net Amounts of Assets Presented in the Statement of Financial Position	127,764	81,520
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	41,823	21,565
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	1,000	11,280
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	84,941	48,675
Embedded derivative - Modco reinsurance treaties
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	1,069	1,330
Net Amounts of Assets Presented in the Statement of Financial Position	1,069	1,330
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	1,069	1,330
Embedded derivative - GMWB
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	43,234	30,261
Net Amounts of Assets Presented in the Statement of Financial Position	43,234	30,261
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	$ 43,234	$ 30,261