OFFSETTING OF ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	$ 266,373	$ 113,111
Net Amounts of Assets Presented in the Statement of Financial Position	266,373	113,111
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	44,189	21,565
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	6,000	11,280
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	216,184	80,266
Total derivatives, not subject to a master netting arrangement or similar arrangement
Total derivatives, not subject to a master netting arrangement or similar arrangement	357	253
Total derivatives
Gross Amounts of Recognized Assets	266,730	113,364
Net Amounts of Assets Presented in the Statement of Financial Position	266,730	113,364
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	44,189	21,565
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	6,000	11,280
Total derivatives, Net Amount	216,541	80,519
Free-Standing derivatives
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	112,810	81,520
Net Amounts of Assets Presented in the Statement of Financial Position	112,810	81,520
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	44,189	21,565
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	6,000	11,280
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	62,621	48,675
Embedded derivative - Modco reinsurance treaties
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	802	1,330
Net Amounts of Assets Presented in the Statement of Financial Position	802	1,330
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	802	1,330
Embedded derivative - GMWB
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	152,761	30,261
Net Amounts of Assets Presented in the Statement of Financial Position	152,761	30,261
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	$ 152,761	$ 30,261