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	$ 227,836	$ 113,111
Net Amounts of Assets Presented in the Statement of Financial Position	227,836	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	185,013	80,266
Total derivatives, not subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	319	253
Net Amounts of Assets Presented in the Statement of Financial Position	319	253
Total derivatives, not subject to a master netting arrangement or similar arrangement, Net Amount	319	253
Total derivatives
Gross Amounts of Recognized Assets	228,155	113,364
Net Amounts of Assets Presented in the Statement of Financial Position	228,155	113,364
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	185,332	80,519
Total Assets
Gross Amounts of Recognized Assets	228,155	113,364
Net Amounts of Assets Presented in the Statement of Financial Position	228,155	113,364
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	185,332	80,519
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	99,003	30,261
Net Amounts of Assets Presented in the Statement of Financial Position	99,003	30,261
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	$ 99,003	$ 30,261