OFFSETTING OF ASSETS AND LIABILITIES (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	$ 139,355,000
Net Amounts of Assets Presented in the Statement of Financial Position	139,355,000
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	31,046,000
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	2,500,000
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	105,809,000
Total derivatives, not subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	13,527,000
Net Amounts of Assets Presented in the Statement of Financial Position	13,527,000
Total derivatives, not subject to a master netting arrangement or similar arrangement, Net Amount	13,527,000
Total derivatives
Gross Amounts of Recognized Assets	152,882,000	130,428,000
Net Amounts of Assets Presented in the Statement of Financial Position	152,882,000
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	31,046,000
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	2,500,000
Total derivatives, Net Amount	119,336,000
Total Assets
Gross Amounts of Recognized Assets	152,882,000
Net Amounts of Assets Presented in the Statement of Financial Position	152,882,000
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	31,046,000
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	2,500,000
Total derivatives, Net Amount	119,336,000
Free-Standing derivatives
Total derivatives, subject to a master netting arrangement or similar arrangement
Net Amounts of Assets Presented in the Statement of Financial Position	82,238,000
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	31,046,000
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	2,500,000
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	48,692,000
Total derivatives
Gross Amounts of Recognized Assets	82,238,000
Embedded derivative - Modco reinsurance treaties
Total derivatives, subject to a master netting arrangement or similar arrangement
Net Amounts of Assets Presented in the Statement of Financial Position	1,321,000
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	1,321,000
Total derivatives
Gross Amounts of Recognized Assets	1,321,000
Embedded derivative - GMWB
Total derivatives, subject to a master netting arrangement or similar arrangement
Net Amounts of Assets Presented in the Statement of Financial Position	55,796,000
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	55,796,000
Total derivatives
Gross Amounts of Recognized Assets	$ 55,796,000