Derivative Instruments and Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES [Abstract]
Derivative Assets, Fair Value, Gross Assets	$ 68,452	$ 41,151
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	68,452	41,151
Derivative Asset, Not Offset, Policy Election Deduction	(48,290)	(28,113)
Cash Collateral Received	(8,053)	(5,279)
Derivative Asset, Fair Value, Amount Offset Against Collateral	12,109	7,759
Derivative Liability, Fair Value, Gross Liability	(63,249)	(36,439)
Gross Amount of Eligible Offsetting Recognized Derivative Assets	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(63,249)	(36,439)
Derivative Liability, Not Offset, Policy Election Deduction	48,290	28,113
Cash Collateral Paid	4,233	176
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ (10,726)	$ (8,150)

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset, deducted from derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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