OFFSETTING OF ASSETS AND LIABILITIES (Details 2) (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 Liabilities	$ 457,240	$ 657,874
Net Amounts of Liabilities Presented in the Statement of Financial Position	457,240	657,874
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 Paid	50,209	20,373
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	365,208	615,936
Total derivatives
Gross Amounts of Recognized Liabilities	457,240	657,874
Net Amounts of Liabilities Presented in the Statement of Financial Position	457,240	657,874
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 Paid	50,209	20,373
Total derivatives, Net Amount	365,208	615,936
Repurchase agreements
Gross Amounts of Recognized Liabilities	340,000	150,000
Net Amounts of Liabilities Presented in the Statement of Financial Position	340,000	150,000
Net Amount	340,000	150,000
Total Liabilities
Gross Amounts of Recognized Liabilities	797,240	807,874
Net Amounts of Liabilities Presented in the Statement of Financial Position	797,240	807,874
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 Paid	50,209	20,373
Net Amount	705,208	765,936
Free-Standing derivatives
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Liabilities	121,659	46,437
Net Amounts of Liabilities Presented in the Statement of Financial Position	121,659	46,437
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 Paid	50,209	20,373
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	29,627	4,499
Embedded derivative - Modco reinsurance treaties
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Liabilities	249,873	411,907
Net Amounts of Liabilities Presented in the Statement of Financial Position	249,873	411,907
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	249,873	411,907
Embedded derivative - GMWB
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Liabilities	84,582	199,530
Net Amounts of Liabilities Presented in the Statement of Financial Position	84,582	199,530
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	84,582	199,530
Embedded derivative - FIA
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Liabilities	1,126
Net Amounts of Liabilities Presented in the Statement of Financial Position	1,126
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	$ 1,126