OFFSETTING OF ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	$ 225,716	$ 207,876
Net Amounts of Assets Presented in the Statement of Financial Position	225,716	207,876
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	53,612	52,487
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	73,935	10,700
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	98,169	144,689
Total derivatives, not subject to a master netting arrangement or similar arrangement
Total derivatives, not subject to a master netting arrangement or similar arrangement	44,985	2,444
Total derivatives
Gross Amounts of Recognized Assets	270,701	210,320
Net Amounts of Assets Presented in the Statement of Financial Position	270,701us-gaap_DerivativeAssets	210,320us-gaap_DerivativeAssets
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	53,612	52,487
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	73,935	10,700
Total derivatives, Net Amount	143,154	147,133
Free-Standing derivatives
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	225,716	110,983
Net Amounts of Assets Presented in the Statement of Financial Position	225,716	110,983
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	53,612	52,487
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received	73,935	10,700
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	98,169	47,796
Embedded derivative - Modco reinsurance treaties
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	1,051	1,517
Net Amounts of Assets Presented in the Statement of Financial Position	1,051	1,517
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	1,051	1,517
Embedded derivative - GMWB
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	37,497	95,376
Net Amounts of Assets Presented in the Statement of Financial Position	37,497	95,376
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	37,497	95,376
Derivatives with PLC
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	6,077
Net Amounts of Assets Presented in the Statement of Financial Position	6,077
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	6,077
Other
Total derivatives, subject to a master netting arrangement or similar arrangement
Gross Amounts of Recognized Assets	360
Net Amounts of Assets Presented in the Statement of Financial Position	360
Total derivatives, subject to a master netting arrangement or similar arrangement, Net Amount	$ 360

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