OFFSETTING OF ASSETS AND LIABILITIES (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Liabilities	$ 589,561	$ 657,874
Net Amounts of Assets Presented in the Statement of Financial Position	589,561
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	31,046
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	9,648
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	548,867
Total derivatives
Gross Amounts of Recognized Liabilities	589,561
Net Amounts of Assets Presented in the Statement of Financial Position	589,561
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	31,046
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	9,648
Total derivatives, Net Amount	548,867
Repurchase agreements
Gross Amounts of Recognized Liabilities	300,000
Net Amounts of Assets Presented in the Statement of Financial Position	300,000
Net Amount	300,000
Total Liabilities
Gross Amounts of Recognized Assets	889,561
Net Amounts of Assets Presented in the Statement of Financial Position	889,561
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	31,046
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	9,648
Net Amount	848,867
Free-Standing derivatives
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Liabilities	49,747
Net Amounts of Assets Presented in the Statement of Financial Position	49,747
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	31,046
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	9,648
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	9,053
Embedded derivative - Modco reinsurance treaties
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Liabilities	395,123
Net Amounts of Assets Presented in the Statement of Financial Position	395,123
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	395,123
Embedded derivative - GMWB
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Liabilities	144,691
Net Amounts of Assets Presented in the Statement of Financial Position	144,691
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	$ 144,691